Court and prison records show the two robbery suspects who hijacked a UPS driver on a wild police chase across South Florida had criminal histories.
Cousins Lamar Alexander and Ronnie Jerome Hill died along with UPS driver Frank Ordonez and an unidentified bystander during Thursday's gunbattle with police.
Officials say Alexander and Hill robbed a jewelry store, seized the UPS truck and fired at pursuing officers before getting in at a stoplight.
Relatives of the victims are questioning why officers had to unleash a torrent of gunfire.
Policing experts say they had to contain the criminals before others were taken hostage.
The chase and the final shootout were broadcast live on television, including the moment when one of the men tumbled out of the truck, mortally wounded.
UPS told CBS Miami that Ordonez had been with the company for five years, but it was his first day driving the truck.