11:10 a.m.: The adult son of a Johns Hopkins patient is briefed by a physician outside Room 873 of the Nelson building on the condition of his mother. The man removes a semiautomic handgun from his waistband and fires a single gunshot, police say, striking the doctor in his lower chest/upper abdomen.
The man is seen running into the room and brandishing the handgun in the direction of his mother, who was confined to the bed.
11:15 a.m.: Hopkins authorities send out an emergency advisory, lock down portions of the Nelson building and evacuate other sections. Police begin shutting down the portion of the hospital campus bordered by Broadway and East Monument and North Wolfe streets.
11:21 a.m.: Police report over scanner that someone may have been shot inside Hopkins Hospital. Officers asking for supervisors, officers on roof.
11:35 a.m.: Hopkins personnel report flood of police cars. Police, fire, FBI and SWAT teams are on the scene.
11:37 a.m.: Police push people back from 600 block of Wolfe Street. Helicopter reported circling above.
11:45 a.m.: A physician at Hopkins has been shot and is in critical condition, police confirm. The suspect has barricaded himself on the eighth floor. Snipers take up positions outside the hospital.
12:23 p.m.: Despite some media reports that the shooter has been "subdued," police say the suspect is still not in custody.
1:30 p.m.: Hopkins tweets that the situation on Nelson 8 is controlled and business for the rest of the rest of the hospital should continue normally.
1:30 p.m.: Police report the SWAT team has determined that the suspect is down on the floor inside an eighth-floor room suffering from an apparent gunshot wound and his mother is unresponsive in her bed.
1:53 p.m.: Police spokesman Anthony Guglielmi says the shooter is dead.
1:53 p.m.: Police tweet that the situation has "ended" and that the suspect was not shot by police. Police describe incident as a possible murder-suicide.
2:44 p.m.: Activity inside hospital is reported as normal.
3:00 p.m.: Mayor Stephanie Rawlings-Black and Police Commissioner Frederick H. Bealefeld III brief news media.
3:50 p.m.: Suspect identified as Warren Davis, 50.
4:35 p.m.: Police say suspect might have used an alias.
4:45 p.m.: Police identify suspect as Paul Warren Pardus of Arlington, Va. The original name given was an alias, police said.
Sources: Baltimore City Police Department and Johns Hopkins twitter feeds; Baltimore Sun staff