Thomas C. Krumpter, a retired Nassau police sergeant and father of the department’s acting commissioner, died early Thursday morning in hospice after being diagnosed with pancreatic cancer about a month ago, according to his family.

He was 76 and lived in South Huntington.

Krumpter, whose son is Nassau acting Police Commissioner Thomas C. Krumpter Jr., served in the Army, spent 21 years as a Nassau police officer, and nearly five decades as a volunteer firefighter, family members said.

“He dedicated his life to family and public service. My father was all about the love of his family, first and foremost,” the commissioner said Thursday. “Just watching as a child, how he was treated by the Nassau County Police Department, how much he loved going to work every day, the only thing I wanted to be was a Nassau County police officer. He truly lived by the motto, ‘You love what you do, you’ll never work a day in your life.’”

Nassau County Executive Edward Mangano said in a statement Thursday: “My thoughts and prayers are with Commissioner Krumpter as he grieves the loss of his father — a dedicated public servant who served as a Nassau police officer, volunteer firefighter and in the United States Army.”

The senior Krumpter began his law enforcement career on Aug. 7, 1964, first working as a patrol cop in the Fifth Precinct, until his promotion to detective in 1971 and assignment to the Second Squad, according to department records.

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About 17 months later, he was promoted to sergeant and assigned to the Seventh Precinct. He later served in the department’s Planning Unit, the Second Precinct, the Property Bureau, and was the commanding officer of the Uniform Section, the records said. He retired on May 31, 1985.

From 1978 to 1983, Chief of Department Steven Skrynecki, then a patrol officer, worked with the elder Krumpter, a patrol supervisor, in the Second Precinct in Woodbury.

The elder Krumpter, Skrynecki recalled, had a reputation as a “conscientious supervisor” who younger officers looked up to and from whom they learned valuable lessons about police work.

“He liked to mentor new officers, to train them and take them under his wing,” Skrynecki said. “He was an individual who always had a pleasant disposition and loved the job and was proud of the job.”

Skrynecki said after his former supervisor’s retirement, he would see him from time to time, and his son’s rise in the department continued to be a major point of pride.

“He was very proud of his son’s accomplishments, just beaming that his son has had the career that he had,” Skrynecki said.

Thomas Christopher Krumpter was born March 9, 1940, in Queens. He was the third of four siblings. His family moved to Valley Stream when he was about 12. He graduated from Valley Stream Central High School and earned a bachelor’s degree in science from New York Institute of Technology. He served in the Army from 1960 to 1962, stationed in Korea.

After his military service, he settled in Huntington Station and married the late JoAnn Lynch on May 1, 1965, in East Northport.

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As a cop, the younger Krumpter said, his father didn’t bring his work home. But after the acting commissioner joined the department in 1992, fellow officers described his father to him as “hardworking and loyal,” his son said, while also “aggressive” yet “compassionate.”

A volunteer firefighter for 48 years with the Huntington Manor Fire Department, he earned the rank of captain and remained active with the department until he recently fell ill. He was the longtime chairman of the fire department’s toy committee, responsible for purchasing gifts for the children of firefighters that were handed out during their annual Christmas party, a role he relished.

His impact on the fire department was far-reaching: His son, the acting commissioner, his brother and nephew, followed him into the fire service.

“He started quite the legacy,” said Krumpter’s nephew, Fire Capt. James Glidden, of the Huntington Manor department. “He was an excellent fireman. He enjoyed the camaraderie. Much like the police department, it’s a band of brothers.”

After Krumpter retired from the police department, he worked as a fraud investigator for Cigna insurance in Syosset. He retired from that about a decade ago and spent time traveling the United States and the Caribbean, fishing in Huntington Bay on his speedboat, watching the Mets and spending time with his family, they said.

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In addition to his son, the acting police commissioner, and daughter-in-law, Lisa Ann Krumpter, the elder Krumpter is survived by another son, John Philip Krumpter, of South Huntington, and a daughter, Kathleen Krumpter, of Manhattan; brother, Philip Krumpter, of Florida; sister, Winnie Schuck, of St. Croix, U.S. Virgin Islands; and two grandchildren. Another sister, Constance Krumpter-Schuster, passed away several years ago.

A wake is scheduled for 7 to 9 p.m. Sunday and from 2 to 4 p.m. and 7 to 9 p.m. Monday at M.A. Connell Funeral Home, 934 New York Ave., Huntington Station. The funeral is set for 10:30 a.m. Tuesday at St. Elizabeth Church, 175 Wolf Hill Rd., Huntington Station.