Police still have not cracked the case involving the 2018 killing of Richard Jefferson's father ... but now, they're hoping a big monetary reward can help change that.
Los Angeles County Sheriff Dept. Lt. Patricia Thomas said on Tuesday they're offering $20,000 to anyone who can assist them in solving the four-year-old case.
Thomas told reporters at a news conference she and investigators believe there are people still out there who saw the suspects that shot 65-year-old Richard Jefferson Sr. in Compton, CA back on Sept. 19, 2018.
She said investigators believe a car full of gang members fired on the former NBA player's father while he was talking with neighbors -- mistakenly thinking he was part of a rival gang.
Thomas urged anyone with info to call the homicide bureau at 323-890-5500.
Jefferson Sr.'s brother, Kenneth, also spoke at the news conference -- and pleaded for anyone with information to come forward as well.
"He was a brother," Kenneth said of Jefferson Sr. "He was a son. He was a father. He was a grandfather, who was very much loved."