Investigators recovered a bloody, 6-inch knife at the scene but didn’t know where the blood came from.
“This was a very brief moment in time, just 40 seconds between first contact and the time of the shooting,” Chief Beck said.
Chief Beck said the time line was based on preliminary interviews. He said the department’s Force Investigation Division will conduct a thorough, transparent probe.
The three officers involved in the shooting have been reassigned during the investigation.
Mr. Jamines had a wife and three children — ages 13, 6 and 8 — in his hometown of Mazatenango, Guatemala, according to his cousin Juan Jaminez, 38. He came to the United States six years ago to find work as a day laborer and spent most of his time looking for jobs in a Home Depot parking lot near his home.
Mr. Jamines was drunk but not dangerous, his cousin and neighbors said.
“Killing a drunk isn’t right,” said Juan Jaminez, also a day laborer. He and others described Mr. Jamines as a friendly, hardworking man who liked to drink on the weekends but wasn’t violent.
“The officer who did this should be subject to discipline and a thorough investigation,” said Juan Flores, 39, a cook at a downtown restaurant who knew Mr. Jamines. “We want to know, is he on vacation or is he fired?”
Mr. Flores said the officers should have used a non-lethal weapon to subdue Jamines.
Beck said the officer involved in the shooting didn’t have a baton or stun gun with him. He said bicycle officers frequently do not carry the selection of nonlethal weapons found in patrol cars.
Juana Neri, 57, a Mexican immigrant housewife who lives nearby, pushed her grocery bag in a baby stroller past the corner where Mr. Jamines was killed.
“It’s bad, what the police did, but what’s worse is the silly stuff that people were doing here,” she said, referring to Monday’s violence. “We are not in our country, and with the problems that Hispanic immigrants have these days, it’s better not to cause problems.”
MacArthur Park was the site of a May 1, 2007, clash in which police officers pummeled immigration rights marchers and reporters with batons and shot rubber bullets into the crowd. Dozens of protesters and journalists were injured. Police said it began with a group of “agitators” outside the park throwing objects at officers.