In announcing the handover, Deputy Police Commissioner Kevin Davis, who led the group of 30 detectives during their investigation, said Thursday that they have discovered a stop the police van made but that investigators had not known about earlier.
Here is a rundown of the timeline compiled from information released by police since Gray's death.
Police Take Gray Into Custody
Police said officers were working in a West Baltimore area with a history of violence and drug deals at 8:39 a.m. when a man, later identified as Gray, was seen at the corner of North Avenue and Mount Street.
The officers approached the man, who then fled on foot, but why they moved toward him remains a part of the ongoing investigation, officials said.
A police officer was heard telling dispatch at 8:40 a.m. that officers had one person in custody in the 1700 block of Presbury Street, two blocks south of North and Mount Streets, police said.
At this morning's news conference, Deputy Commissioner Kevin Davis said Gray ran from the police before being taken into custody on that same city block.
A “wagon,” or van, was requested for transport at 8:42 a.m., according to earlier Baltimore police statements, and Gray asked for an inhaler.
Davis confirmed this morning that the police made a stop at Mount and Baker streets, though no further details about that stop were released. This intersection is just one block south from where Gray was taken into custody.
Davis said police have since determined that the wagon made a second stop they had not previously known about, at N. Fremont Avenue and Mosher Street. They did not release other details.
Investigators learned about this stop after reviewing video footage from a privately owned camera.
The van then resumes the schedule that officers had previously known about with a stop at Druid Hill Avenue and Dolphin Street, which is not far from the second, unknown stop, though no further details about what happened here have been released.
The wagon then goes to North and Pennsylvania avenues to pick up an additional prisoner.
Davis did not release the time for each of these stops, but police have already said that at 8:46 a.m., the driver of the van reported that he believes Gray is acting “irate.” An officer asks the van to stop so paperwork could be completed, according to Baltimore police. At that point, Gray is taken out of the vehicle, and police said he was placed in leg irons and then put back in the van. Police have not specified when this occurred in relation to the van’s various stops.
By 8:54 a.m., the wagon had cleared Mount Street and was heading toward central booking, police said in earlier statements.
At 8:59 a.m. a request was made by the driver of the van for an additional "unit" to check on Gray, police say. There was some undisclosed communication with Gray at this point, police said in earlier statements.
Arrives at the Police Station
Police have not released the official time when the wagon arrived at Western District station, but at 9:23 a.m. emergency medical services directed a technician to respond for an injured patient, as heard on a recording of the call that was publicly released.
A minute later, police officers requested paramedics to the Western District to transport the man to the University of Maryland's Shock Trauma Center. In a subsequent charging document, police said, “During transport to Western District via wagon transport the Defendant suffered a medical emergency and was immediately transported to Shock Trauma."
On-scene medical responders said Gray was not breathing at 9:37 a.m., according to EMS reports.
Transported to the Hospital
He was then transferred to Shock Trauma. On Thursday, April 16, Gray’s family’s attorney said he had gone into a coma, and he died on the morning of Sunday, April 19.
ABC News' Katherine Faulders contributed to this report.