(CNN) -- Community organizations in Los Angeles are disputing official reports about a recent fatal police shooting of a Guatemalan immigrant.
The groups say the man did not have a knife, as police have said. They will hold a news conference Tuesday to demand that the officer involved in the shooting be charged with murder.
Manuel Jamines, a 37-year-old husband and father of three, was killed September 5 by police after allegedly threatening someone with a knife.
"Numerous witnesses have come forward to testify that there in fact was NO knife in Mr. Jamines' hands at the time of the murder," the Southern California Immigration Coalition said on its website.
The coalition said it will hold the news conference in front of the district attorney's office at 5 p.m. (8 p.m. ET).
The death sparked days of protests on the streets near downtown Los Angeles. Protesters hurled eggs, fruit, televisions and other items at police who responded with foam and other nonlethal projectiles.
Los Angeles Police Chief Charlie Beck, politicians and local leaders held a meeting last week at a school to give the community information about the incident.
Beck was greeted with boos and whistles and chants of "justice" as he tried to address the crowd.
Beck promised the boisterous crowd "a fair and impartial investigation" into the shooting.
At that meeting, police displayed the blood-stained blade they say Jamines was holding before the shooting.