The 21-year-old, Luis Alberto Garcia, was arrested this morning after an intense manhunt.
Tucson Police Department said he and another man are responsible for killing 52-year-old Mark Doe.
It was at a parking garage on Congress and Toole where police said two men were robbing people at gunpoint. The 52-year-old saw a wrong and he lost his life trying to make it right. He died doing something for somebody, Greg Eddings, a co-worker of Doe, said. That was how it was. He thought of other people, he put others before himself.
Eddings is a supervisor at Chula Vista landscaping. He said Doe was a dedicated and hard-working employee.