Marienus J. Segeren was born on April 30, 1941 in Passaic, New Jersey and was raised in Camden, New Jersey. He resided in Oaklyn, New Jersey. After graduating from Camden High School, he attended college at the Spring Garden Institute of Technology in Philadelphia, Pennsylvania. Prior to joining the New Jersey State Police, he worked for the Langston Company in Camden.

Trooper Segeren enlisted with the New Jersey State Police on February 7, 1969 as a member of the 77th State Police Class and was stationed at Troop “C” Tuckerton. He was later stationed at Mays Landing, Malaga and the Atlantic City Expressway.

Trooper Segeren died as a result of injuries received in a Troop car accident in the line of duty.

At 6:00 A.M. on July 25, 1971, Trooper Segeren was on routine patrol on the Atlantic City Expressway travelling west in the outside lane in Hamilton Township, Atlantic County. As he neared Mile Post 21.6 west, his vehicle wandered into the right shoulder and off the paved portion until the Troop car slightly struck the mile post marker. He travelled 126 feet on the shoulder before making a sharp veer back on the paved portion of the road. He careened to the left and skidded broadside across the westbound lanes towards the Weymouth-Elwood Road bridge abutment and its guardrail.
The Troop car impacted with the guardrail and continued along 36 feet in its broadside position before hurtling over and striking a concrete bridge support with the right front door post. The impact with the pillar caused the vehicle to tear apart at the firewall, the engine part spinning to the right around to the back of the pillar and the passenger part spinning to the left and striking the next support pillar before coming to a stop.

Trooper Segeren suffered cerebral contusions and a fractured skull, a crush injury to his chest with lacerations and damage to his liver and lungs. He was taken to Kessler Memorial Hospital in Hammonton, where he was pronounced dead on arrival.

Trooper Segeren served 2 years and 5 months with the New Jersey State Police.

Trooper Segeren was survived by his wife and four daughters ages 9, 8, 5 and 4 years. He was 30 years old.