The father of a Chicago teenager who was shot early this week held a news conference Wednesday, saying he wanted to know why emergency services workers had covered his son with a sheet even though he was still alive.

That’s one of several questions that Eric Carey, the father of the teenager, Erin Carey, 17, has about his son’s death, he told reporters.

“You don’t throw a sheet over his head and walk to the next person,” Mr. Carey said. “Did you check and see if he even had a pulse?” he asked, at times tearful and seated next to a lawyer. “I need to know why did my son got shot,” he said.

The Chicago Fire Department, which oversees emergency services, has said it is investigating not only why Erin was covered with a sheet while he was still breathing, but also why it took 40 minutes to transport him to the hospital.