A memorial service is underway for a Utah police officer who was fatally shot earlier this month while working overtime to pay for his cancer treatments.

Several thousand officers in uniform saluted Monday and bagpipes played as a casket carrying the body of Officer Douglas Scott Barney was brought into an arena in a Salt Lake City suburb. Barney's young son pushed the casket, which was draped in an American flag.

The 44-year-old worked for the Unified Police Department and died on Jan. 17 while responding to a traffic accident. The Officer Down Memorial organization says he was the first officer killed in the U.S. this year.

Authorities say Cory Lee Henderson killed Barney and later died in a shootout with police.

Barney's wife and Utah Gov. Gary Herbert are scheduled to speak at the funeral.