A $1 million reward was offered for the arrest and conviction of ex-police officer Christopher Dorner, alleged to have killed two law enforcement officers and two civilians.
The city is the latest in a series of agencies that have decided to withhold their pledges after Dorner died in a burning cabin. Police said Dorner killed himself Feb. 12 as officers closed in so there was no arrest.
Riverside Mayor William "Rusty" Bailey said Wednesday in a letter that the city "called for information leading to the arrest and conviction of the perpetrator and that didn't occur."
"We were bound by government code to obey the language of our resolution and not give a gift of public funds," he added in the letter, as quoted by The Press-Enterprise newspaper in Riverside.
A couple who were tied up and their car stolen and a man whose truck was hijacked by Dorner have filed claims for the reward, which was offered by Los Angeles Mayor Antonio Villaraigosa.
The Los Angeles Police Department said the reward should be paid, the Los Angeles Times reported.
LAPD Deputy Chief Kirk Albanese said to deny the reward "would be disingenuous" and could hamper police attempts to get information by offering a reward in the future.