It's a cell phone, Tampa police now say helped them connect 24-year-old Howell Emanuel Donaldson III to randomly killing four people in 5 weeks.
Four people have been killed in the Seminole Heights area of the city since 9 October.
"We have to be very careful about what we release because this person might be completely innocent", said Dugan, who met with reporters at Tampa Fire Rescue Station #4, south of the McDonald's. The co-worker looked inside the bag, spotted the weapon and approached a Tampa police officer who was sitting in the restaurant doing paperwork.
A LinkedIn page apparently belonging to Donaldson said he graduated the Queens university in 2015 with a degree in sports management.
The crack in the case came Tuesday when Donaldson brought a bag with a loaded handgun in it to his job at a McDonald's and asked a co-worker to hold it while he went across the street, authorities said. The person in the video, Dugan said then, had become a suspect.
"The person who called us, I can not thank them enough for standing up and doing the right thing", the chief said. The manager noticed the gun-a.40 Smith and Wesson-and alerted a nearby police officer who eventually arrested Donaldson. He picked it up after the four-day waiting period and the first killing happened two days after that.
The four random murders didn't appear to be robberies, leading police to believe they were the work of a serial killer.
"You know, 51 days ago, I said this was a struggle between good and evil", said Tampa Mayor Bob Buckhorn during Tuesday's news conference.
Residents were told not to walk alone at night as police investigated the killings. "Today the light shines".
Four people have been killed in the neighborhood since October 9. "This community begins the healing process".
Mitchell's death was followed by the killings of Monica Hoffa on October 11, Anthony Taino Naiboa on October 19, and Ronald Felton on November 14.
According to Altman, Donaldson is suspected of murdering 22-year-old Benjamin Mitchell, 32-year-old Monica Hoffa, 20-year-old Anthony Naiboa and 60-year-old Ronald Felton in Tampa's Seminole Heights neighborhood.