An officer was killed and multiple people were injured in a shooting reported at UPMC Memorial Hospital in York County, Pennsylvania on Saturday afternoon.Timeline of eventsIn a press briefing at the hospital, District Attorney Timothy Barker said the shooter, identified as Diogenes Archangel-Ortiz, entered the hospital carrying a bag containing a handgun and zip ties around 10:35 a.m.Archangel-Ortiz went to the ICU and held hostage multiple members of the UPMC staff, where he discharged his weapon, shooting three staff members. A nurse and a custodian who were shot are in stable condition. Another doctor was grazed by a bullet and didn’t need medical attention. A fourth staff member sustained injuries from a fall during the incident.A UPMC officer responded to the incident immediately and Archangel-Ortiz shot at them. Law enforcement made a formation to engage with Archangel-Ortiz and found he was holding a staff member at gunpoint.Archangel-Ortiz ordered the police to get back, and they did so to keep the hostage safe.Officers attempted to talk to and disengage Archangel-Ortiz while they created a new formation.Archangel-Ortiz then came forward while holding the hostage at gunpoint and police fired at and killed the gunman.The incident came to an end at approximately 11:13 a.m., according to Barker. Three officers were struck in the exchange. A Springettsberry Township officer and a North York County Regional officer were injured but have since been released from a hospital. West York Borough police officer Andrew Duarte was transported to WellspanYork Hospital where he succumbed to his injuries at 12:19 p.m.Full press briefing below:Search for motiveBarker stated Saturday that Archangel-Ortiz had contact with the ICU earlier in the week for a "medical purpose involving another individual."Lester Mendoza, a physician assistant at UPMC Memorial Hospital in York, shared on social media that he spoke to Archangel-Ortiz earlier in the week, informing him that a loved one had died."I spoke with the very man who did this act, interacting with him multiple days. I was there when we delivered the worst news imaginable to him — that his loved one was gone. I saw his devastation firsthand. In that moment, I truly did not see a monster. He was simply broken," the statement reads, in part. The full statement can be read here.Officials have not released any official motive for the deadly shooting. Video below: Officers respond to shootingHonoring Andrew DuarteAndrew Duarte spent more than six years as a police officer and just recently celebrated his 30th birthday before his life was taken in the UPMC Memorial Hospital shooting.A procession left the York County Coroner's Office Monday morning to transport Duarte's body to Lehigh Valley for an autopsy. Gov. Josh Shapiro ordered the United States and Commonwealth flags to fly at half-staff in honor of fallen police officer Andrew Duarte.The officer was also honored in two events on Saturday night.Community members came together at the West York Administration Office on West Poplar Street to lay flowers and light candles to show support and respect for Andrew Duarte.A procession also took place where dozens of first responders lined up along George Street at the entrance to York Hospital and emergency vehicles drove by and flashed their lights.Duarte's mother called him "an amazing young man." "He had a warrior heart and a warrior spirit. He was incredibly intelligent, loving, sweet and kind. We were very close," Nancy Duarte Matarese said.Nancy said she was not surprised to hear her son rushed into the hospital to help on Saturday during the shooting, saying that was the kind of person that he was.Related: Mom of officer killed in Pennsylvania hospital shooting shares heartbreakRelated: How to help family of fallen West York officer Andrew DuarteHospital securityWellSpan Health is said they are enhancing security measures at York Hospital during and after the incident out of an abundance of caution.This includes restricting movement in and out of facilities during emergency situations in cooperation with law enforcement. WellSpan also said they have utilized metal detectors and have had an armed officer at their Emergency Department entrance for the last two years.They have also implemented Strongline, "a real-time incident notification system and badge for WellSpan team members to press when in a threatening situation." This program has been implemented across 187 WellSpan locations.