He told police that the security guard had disrespected him during an earlier altercation at a Motel 6.
Muhammad hid out in a ravine and practiced voodoo rituals after the motel slaying. He also told investigators he is Muslim, but he prays to seven different gods and has not been to a mosque in 25 years.
On Tuesday, after he learned he was wanted for the guard's death, he set out to kill more people, Dyer said.
He noticed a white man in a utility truck and fired into the truck, killing Zackary Randalls. He also shot Mark Gassett on a sidewalk, pumping two more rounds into him as the man lay on the ground. Finally, he fired in the direction of a bus stop where he spotted three white males.
They scattered, and Muhammad picked the one who appeared heavier, David Jackson.
"That was going to be his target, and he caught up with him and he fired two rounds into this individual," Dyer said.
Dyer said Muhammad showed no remorse in interviews and laughed many times.
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Muhammad "is not a terrorist but he is a racist," Dyer said.
Muhammad has a criminal history that includes arrests on weapons, drugs and false-imprisonment charges. He has also been accused of making terrorist threats and been associated with gangs, but he was not a confirmed member, police said.