Veth Mam

Veth Mam (KTLA-TV)

FULLERTON, Calif. (KTLA) -- A federal lawsuit has been filed against the Fullerton Police Department -- a department already under fire in connection with a homeless man's death -- in the wrongful 2010 arrest of a Baldwin Park man.

On Wednesday, the Police Department admitted to mistakenly arresting 35-year-old Veth Mam on suspicion of attacking a police officer in October.

Chief Michael Sellers -- who is currently on medical leave -- and Officers Kenton Hampton, Frank Nguyen, Jonathan Miller and Daniel Solorio were listed as defendants.

Shortly after the department acknowledged the mistake, Fullerton's acting chief, Kevin Hamilton ordered an internal investigation after reviewing cell phone video of Mam's arrest.

"Based upon reviews of the video, it is Hamilton's preliminary determination that we arrested the wrong guy that night, Sgt. Andrew Goodrich told the Los Angeles Times. "It was very chaotic scene that night."

Mam was videotaping a friend's arrest last year when an officer slapped the phone out of his hand. Another bystander picked up the phone and kept recording.

The video shows officers wrestling Mam to the ground and arresting him.

Mam, who was accused of attacking and choking an officer, was acquitted by a jury in July. He plans to file a wrongful arrest lawsuit.

Cell phone video has also come to play in the recent and controversial death of Kelly Thomas, a mentally-ill homeless man who was allegedly beaten by six Fullerton police officers.

Community members have blamed poor leadership in Thomas' death. Some are calling for the mayor and police chief to resign.

Thomas' father, Ron Thomas, met privately with Mayor F. Richard Jones Wednesday morning.

After the meeting, Thomas told reporters that Jones had indicated he was considering stepping down.

"He made it very clear to me that he was absolutely ready, as of last night, to resign," Thomas told KTLA.

"He can't take anymore of this... So we'll see what happens with that. He just didn't want to go out like this... I gave him my thoughts on how he could still do it honorably."

Mayor Jones released the following statement later in the day:

"Reports that I am considering resigning my position as Mayor of the City of Fullerton are erroneous. I am not resigning. There is much work left to be done in our great city." Witnesses say Kelly Thomas, 37, was kicked, beaten and shocked with a Taser several times on July 5 at the Fullerton Transportation Center. Thomas fit the description of someone who had broken into cars in a parking lot, officials said.

Thomas was hospitalized in "very critical condition" at UC Irvine Medical Center. He was taken off life support on July 10.

Ron Thomas calls his son's death "cold-blooded murder." He says that some of the blame lies with Mayor Jones, who is at the helm of the Fullerton City Council, which oversees the police department.

During a loud and sometimes contentious city council meeting Tuesday night, some people fired harsh words at the panel, and openly criticized the mayor for what they consider foolish and insensitive comments about the case.