Officer critically injured by gunfire well-liked by colleagues.

The 27-year-old Orlando police officer critically injured after being gunned down during a confrontation with a domestic violence suspect is described by former co-workers as a hard worker who made a difference in his community.

Officer Kevin Valencia was shot in the head while responding to a domestic violence call on Monday morning, where four children were later held hostage and killed.

“Kevin and his wife have two small children ages 5 and 8 [months],” wrote fellow Orlando officer Shawn Dunlap in a GoFundMe page set up for Valencia and his family. “Donations will help the family with short-term and long-term expenses while he fights to recover from these devastating injuries.”

Valencia remained in critical condition on Tuesday evening, unable to communicate with doctors, Orlando Police Chief John Mina said.

The gunman was identified as Gary Wayne Lindsey Jr., a 35-year-old convicted felon on probation for arson and domestic-related charges. Mina said that while fellow officers ran to Valencia’s aid, Lindsey managed to barricade himself.

The four kids — ages 1, 6, 10 and 11 — and Lindsey were found dead after a daylong SWAT standoff with Orlando police.

Valencia graduated from Miami Dade College’s Kendall Campus in 2013 with a law enforcement degree, according to MDC’s Director of Communications Juan Mendieta.

In January 2014, he joined the Doral Police Department as a patrol officer.

“He was just perfect — a hard worker, a people’s person,” said former Doral police chief Donald De Lucca, “I don’t know anyone who didn’t like him.”

When Valencia left Doral in November 2016 to be closer to his family in Orlando, it was a “big loss” for the department, De Lucca said.

Doral Mayor Juan Carlos Bermudez said Valencia made “a great difference” in his community.

“It’s clear that he continues to heroically act in the interest of public safety, even now as part of the Orlando Police Department,” Bermudez said in a statement. “Our thoughts are with him as we wish him a speedy recovery.”

While living in South Florida, Valencia, his wife and two children attended the Pulse Miami Church, according to a post from the church’s Facebook page.

Details were still emerging on Tuesday about Valencia’s work at the Orlando Police Department, or specifics of how the call that led to a nearly 24-hour police standoff unfolded.

“For us, our number one priority now is the health and wellbeing of Kevin Valencia and the health and well-being of our officers,” Mina said.

Mina said Valencia’s squadmates, who he said were “shaken up,” were sent home from Orlando Regional Medical Center on Monday.

“We’ve been through this before. It’s hard. It’s very traumatic to have one of your officers shot in the line of duty,” Mina said. “We are receiving so much support from our community, and that’s what we need for now.”

At Tuesday’s bell-ringing ceremony to honor the 49 people killed in the Pulse nightclub massacre two years ago, Orange County Sheriff Jerry Demings said Monday’s standoff was also difficult for his deputies.

“Most of my SWAT members — they’re young men with young families with children themselves, and they had to go in and discover the bodies of those children,” Demings said. “We had another mass shooting last night.”