Robert Solis, 47, was arrested on Friday after police said he killed Rep. Sandeep Dhaliwal, a Sikh observer who years ago gained national attention when obtained permission to wear a turban as part of the Harris County Sheriff's Office uniform.
Authorities did not say what Solis would have done to violate his probation. Solis has been out of prison on parole since 2014, 12 years after being convicted in Harris County for kidnapping and assault aggravated by a deadly weapon, court records show.
"He (Solis) … probably knew he was going back to jail and didn't want to go back to jail," Sheriff Major Mike Lee said on Friday, the agency said. CNN KTRK Affiliatewhen asked about a possible reason.
It was not immediately clear what Dhaliwal knew about the warrant.
Solis is charged with manslaughter. A judge ordered Solis to remain unsecured in a probable case at the Saturday morning hearing. His next court appearance is scheduled for Monday.
A woman who was in the vehicle with Solis was also arrested. It was not immediately clear if she was facing charges.
"This guy had a heart of gold," said Adrian Garcia, Harris County Police Commissioner. "He treated his brothers and sisters in law enforcement as if they were just brothers and sisters. He thought of them before thinking of himself. He thought of the wider community before thinking of himself."
A funeral for Dhaliwal is scheduled for Wednesday. A Sikh religious ceremony will be held at 10.30 local time and a law enforcement ceremony at 11.30, according to a tweet from the Harris County Sheriff's Office. The public is welcome to attend both ceremonies, he said.
Helper Dashcam helped identify his alleged killer, authorities say
Dhaliwal panel camera helped identify Solis as his alleged killer, say the investigators.
The deadly rendezvous began as a regular traffic stop shortly before 12.30. CT in the Copper Brook area of northwest Harris County, said Lee, the Harris County Sheriff.
The panel camera video shows Dhaliwal talking to the driver "no combat, no discussion," Lee told reporters. The driver's door was open at one point while the policeman and the driver talked.
Dhaliwal closed the driver's door while the driver remained in the vehicle. As he turned to return to his patrol car, the driver's side door opened and a man got out of the vehicle "almost immediately running with a gun already open," Lee said.
The panel camera captured the fatal moment when Dhaliwal was shot from behind in the back of the head, Lee said.
"Coldly, ambush-style, he shot police officer Dhaliwal from behind," Gonzalez said. "It's the worst day, the worst nightmare for any police executive."
The shooter returned to the vehicle and drove away. A resident who worked in the nearby yard heard the shots and ran to help the deputy.
Authorities identified Solis by watching the video from Dhaliwal's camera. They took a picture of the suspect from the camera and immediately took it, Gonzalez said.
Solis was arrested in an ice cream shop less than a mile from the shooting site, officials said. Solis was there for almost half an hour before being arrested. CNN affiliate KPRC reported.The deputies of the pistol believe it was used to kill Dhaliwal was recovered, the sheriff said.
Solis was ordered to undergo a mental assessment
Solis shot Dhaliwal "in the back of the head as he walked away," "coldly and cowardly," a prosecutor wrote in a court case arguing that there was no bond.
Solis was ordered to undergo a mental assessment, court records show.
In 2002, he was sentenced to 20 years in prison following his convictions for kidnapping and assault.
He was released in 2014 and would remain on probation until 2022, according to the Texas Department of Public Security.
The deputy leaves a legacy as a pioneer
Dhaliwal leaves his wife and three children.
He leaves a legacy as a pioneer for the department he served for a decade. He was the first member of the Sikh community to become deputy to the Harris County Sheriff, officials said.
In 2015, about six years after Dhaliwal's entry, the sheriff's office made an official policy that allowed him to wear his beard and turban, according to CNN KTRK Affiliate.
"As a Sikh American, I felt the need to represent the Sikh community in law enforcement," Dhaliwal said at the time. "It will give me a chance to open the conversation."
Before becoming a deputy, Dhaliwal was a businessman for a truck company. He found that the Harris County Sheriff's office needed someone like him to build bridges with the Sikh community and sell his business. He received a lower salary as a detention officer and worked to be a deputy, Garcia said.
Dhaliwal represented community diversity and inclusion, Houston Mayor Sylvester Turner tweeted.
"He wore the turban, represented his community with integrity, respect and pride and was respected by everyone," Gonzalez said.
Sikhism is the fifth most popular religion in the world. It is a monotheistic faith that believes in equality and service to others. There are 25 million Sikhs worldwide and about 500,000 in the United States, according to The Sikh Coalition.
A community cries
In the hours after Dhaliwal's death, the residents of the community he served gathered at an impromptu vigil and used social media to honor him.
Online, people shared photos and videos of their encounters with him. One woman sent the sheriff's office a video of Dhaliwal interacting with his deaf son in a restaurant.
"He laughed and joked with all of us and left a bright impression on my deaf son," she said, according to the sheriff's office, who tweeted the video.
People gathered Friday night at a community-led outdoor candlelit vigil in the Copper Brook area near where the shooting took place.
Gonzalez the sheriff passed by.
"Grateful beyond words for witnessing the improvised vigil," he tweeted.
CNN's Amir Vera, Devon Sayers, Tina Burnside and Christina Maxouris contributed to this report.
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