LAPD officers responded to the scene in the 2100 block of Florence Avenue around 5:20 p.m.
According to authorities, a suspect entered the auto body parts store and allegedly confronted the owner. An argument ensued and the suspect shot the victim multiple times before fleeing through the alley.
The victim has been identified as Rigoberto Dupre, 54, of Los Angeles. Police say Dupre was well-known in the area and had no gang affiliation.
The suspect was described as a 22-year-old black male. He was last seen wearing a dark hooded sweatshirt and carrying a small handgun.
"Wallet was there, money was there, he didn't pat him down, nothing, he just shot him and left," said Luis Dupre, Rigoberto's son.
Luis Dupre last saw his father alive Monday morning at his dad's auto work shop on the 2100 block of West Florence Avenue. Luis says he left for Whittier to work on a landscaping job. Then he got a call just after 5 p.m. that his father had been shot.
"We have not established any motive," said LAPD Lt. Jeff Nolte. "We have no witnesses to the homicide at this point, so we have not been able to establish a motive at this point. But we do believe that there is people on Florence or Cimmaron or in the area that saw things that will be important to us."
Rigoberto Dupre leaves behind a devastated wife and two grown sons.
If you have information on the case, contact the Los Angeles Police Department at (877) LAPD-24-7.