David Mark Halversen

David Mark Halversen, passed away on December 31, 2025. A graduate of Sayville High School, David moved to Lake Ronkonkoma in 1996. Dave worked for Brookhaven Instruments for 35 years and then moved to Behlman Electronics. Dave spent much of his time camping and being outdoors with his son Jacob, where they would fish and kayak. David was a knife enthusiast and avid collector and had a strong interest in exotic pets, owning tarantulas, snakes, and assorted lizards. He also loved his dogs, especially his German Shephards.  Dave also enjoyed horror movies, he and his son Jacob would watch one a night for the entire month of October, leading into Halloween.

He is survived by his son Jacob, his wife Melissa, his brother Robert and his wife Linda, his sister Katherine Jackson and her husband Shawn, and his father Elliot. He is predeceased by his mother Grace.

Visitation- Thursday January 8, 2026 from 2-4:30 & 7-9:30 p.m. at our West Sayville Funeral Home, 245 Main St. 

Chapel Service- Thursday January 8, 2026 at 8:00 p.m. at our West Sayville Funeral Home, 245 Main St.

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