Maricopa County Sheriff's Office, Associated Press
In this undated photograph provided by the Maricopa County Sheriff's Office, is the booking photo for Ernest M. Atencio, 44, Monday, Dec. 19, 2011, in Phoenix. While being booked into jail on suspicion of assault Friday, Atencio became abusive and combative forcing police and sheriff's deputies to restrain him, and place him in a jail cell. Soon after, he needed medical attention and CPR, and was taken to a local hospital, where he remains.

PHOENIX — A man found unresponsive in a jail cell after fighting with deputies at a Phoenix jail over the weekend has died after being taken off life support, an attorney representing his family said Wednesday.

The family of Ernest Atencio, 44, is also exploring a lawsuit against the embattled Maricopa County Sheriff's Office, said Michael Manning, a Phoenix attorney who has won five wrongful-death lawsuits against the department.

Manning said Atencio's family took him off life support Tuesday. He said Atencio had no brain activity from the moment he arrived at the hospital Friday, did not have alcohol or drugs in his system and had marks from a stun gun on his body.

"At this stage we all have to give the MCSO the benefit of the doubt, but based on prior experience with these people, I have plenty of doubt," Manning said, adding that the sheriff's office needs to release any surveillance video that may have captured Atencio's scuffle with them.

Manning said that in all five of the wrongful-death cases he won against the sheriff's office that video of the incidents had been degraded or destroyed.

The sheriff's office did not immediately respond to a request for comment.

Earlier in the week, Sheriff's Deputy Director Jack MacIntyre said in a prepared statement that Atencio was combative when Phoenix police brought him to downtown Phoenix's Fourth Avenue jail for booking and that he was placed in a so-called "safe cell" to calm him down after fighting with deputies.

MacIntyre said that Atencio was being observed by medical personnel while inside the jail cell but that 15 minutes later, he was found unresponsive. He said they tried to resuscitate Atencio and took him to a hospital.

Sheriff's spokesman Jesse Spurgin said Monday that the office would not release details because an investigation was ongoing.

Phoenix police said Atencio was accused of kicking at the door of an apartment complex late Thursday and confronting a woman "in an aggressive manner." He was detained early Friday to be booked on an assault charge.

Latino activists say that Atencio's death raises more questions about practices under Sheriff Joe Arpaio.

A Justice Department investigation released last week found that Arpaio's office committed wide-ranging civil rights violations against Latinos, including a pattern of racial profiling and heavy-handed immigration patrols based on racially charged complaints. A defiant Arpaio has called the allegations a politically motivated attack by the Obama administration.

Manning said that Atencio was in the Army from 1988 until 1992 and served in Korea before being medically discharged for a shoulder injury. He was divorced, had three sons, who are 15, 16, and 21, and worked in his family's real estate business, he said.

Manning said that there was evidence that Atencio may have had bipolar disorder and that his family said he might have been off his medication recently.

"They said he was a good father and a good employee, that he was not someone that was in trouble often," Manning said. "They're devastated right now. They can't even speak coherently.

"It's a gruesome time for them right now," he added, "made all the more poignant that we're just days away from Christmas."