David Kozák was a 24-year-old postgraduate student residing in the village of Hostouň in the Kladno region, located just outside Prague. Academically high-achieving with no prior criminal record, Kozák had earned a bachelor’s degree in history and European studies from Charles University and was actively pursuing a master’s degree focusing on Polish history. He was described by faculty and peers as an excellent, quiet student who kept entirely to himself. Behind this unassuming academic persona, however, Kozák was harborring a severe, pathologically unhinged desire for generalized violence against society.

State investigators looking into his psychological profile found that his violent ideation had escalated rapidly throughout late 2023. Intelligence sweeps discovered unconfirmed social media accounts linked to him that contained detailed entries praising foreign mass killings, indicating a dangerous desire to execute a large-scale public tragedy. State prosecutors later revealed that while Kozák had sought out independent psychiatric consultations in the months prior to the attack, his dark intentions eluded professional detection, leaving him technically cleared under existing Czech medical-licensing crosschecks.

Crucially, forensic ballistics mapping tied Kozák to a separate, highly volatile crime executed just one week prior to the university massacre. On December 15, 2023, a 32-year-old man and his two-month-old infant daughter were found shot to death in the Klánovice forest on the eastern outskirts of Prague. Post-incident ballistic evidence established a 100% positive match, proving that Kozák had used the secluded woods as an unprovoked, cold-blooded hunting ground to test his combat efficiency before advancing to his primary targets.

Kozák operated as a fully legal, heavily armed firearm collector under Czechia’s existing licensing structures. He held valid permits for a total of eight separate weapons, including high-capacity semi-automatic handguns, a shotgun, and military-style long guns. His primary weapon for the university attack was a premium ZEV AR-10 semi-automatic rifle chambered in .308 Winchester, fitted with a high-magnification optical scope and a heavy match-grade barrel designed for high-accuracy tracking at distance.

On the morning of December 21, 2023, Kozák initiated his final sequence. Inside the family home in Hostouň, he shot and killed his father. He rigged the residence with improvised incendiary devices and loose ammunition, intending to burn down the home to destroy evidence. He then packed a massive rolling equipment case with multiple firearms, hundreds of rounds of ammunition, and matching magazine sets. He took a bus directly to central Prague, heading toward the Jan Palach Square university complex with the clear intent to murder as many civilians as possible.

**12:45 PM // The Intelligence Divergence:** Czech police discovered the body of Kozák’s father in Hostouň and received a tip that Kozák was en route to Prague with explicit plans to commit suicide. Knowing Kozák had a scheduled lecture at 14:00 PM in the Celetná Street building of the Faculty of Arts, police tactical teams deployed immediately to evacuate that specific site, completely unaware that Kozák was instead traveling to the larger primary Faculty of Arts main building on Jan Palach Square.

**14:59 PM // The Corridor Breach:** Kozák walked into the Jan Palach Square building completely unmonitored, rolling his heavy weapons container past the lower reception desks. He moved up to the fourth floor, where he unpacked his scoped AR-10 rifle. He immediately began moving systematically down the main hallways, firing through classroom doors and executing students and instructors at close range.

**15:10 PM // High-Altitude Ledge Perch:** As panic erupted through the building, students began barricading doors with heavy desks and lecture chairs. Desperate to escape Kozák’s advance, a group of students climbed out of a fourth-story window, sheltering on a narrow, exposed exterior stone ledge. Tragically, one female student lost her footing during the evacuation and fell to her death on the pavement below.

**15:15 PM // Rooftop Sniper Deployment:** Kozák exited onto the high rooftop balcony overlooking Jan Palach Square. Utilizing the scoped AR-10 rifle, he began firing long-distance shots down into the streets below, targeting fleeing tourists, passing civilian vehicles, and the initial wave of responding police units. Police cordoned off the entire historic Old Town sector, drawing sidearms and submachine guns to return fire toward the roof line.

**15:20 PM // Tactical Encirclement and Suicide:** First responder units aggressively rushed up the internal stairwells of the building, systematically clearing floors to corner the shooter. Realizing his tactical lines were completely severed and that heavily armed police were closing in on the balcony door, Kozák dropped his AR-10 rifle. He pulled out a shotgun, placed it to his head, and fired, terminating his life as officers breached the roof deck. The active campus assault lasted 21 minutes, leaving 14 innocent victims dead and 25 wounded.

The structural interior of the Faculty of Arts main building was left heavily scarred by high-velocity .308 ballistic impacts. The fourth floor was covered in shattered safety glass, blood pools, and splintered wooden doors where Kozák had forced entry. Jan Palach Square was littered with abandoned items from fleeing civilians, shell casings, and emergency vehicles. Special forensic teams spent days uncovering Kozák’s extensive weapon drop layout left scattered across the rooftop platform and corridors.

The police response faced intense legislative and public scrutiny over why Building 12 on Palach Square wasn’t secured when initial intelligence showed Kozák was heavily armed and suicidal. An internal investigation report by the Czech Police concluded that responding units acted in accordance with operational protocol. However, critics highlighted severe gaps in emergency alert text-messaging systems, which failed to warn students inside the main building while tactical units were focusing on the wrong location down the street.

The Charles University shooting deeply shook the Czech Republic—a nation with a strong gun culture where firearm ownership is historically viewed as a constitutional right. Prime Minister Petr Fiala and President Petr Pavel declared a National Day of Mourning on December 23, 2023, marked by lowered state flags, nationwide moments of silence, and massive candle shrines outside the university’s historical gates.

The unprecedented scale of the tragedy forced immediate parliamentary reviews regarding the country’s Weapons Act. Lawmakers pushed forward adjustments to tighten gun laws, mandating that gun shops report suspicious ammunition purchases to police and expanding the power of state medical boards to review a gun owner’s mental fitness. Charles University temporarily closed the main Faculty of Arts building for extensive structural repairs, eventually reopening the lower floors with a focus on psychological support networks and updated campus security entry protocols.

The historical verified registry of the 14 innocent victims executed inside Charles University by David Kozák on December 21, 2023: