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Dec. 12, 1963 – Feb. 25, 2014

Mark J. Mikulski left his mark across world and, to hear his family talk, in people’s hearts, as well.

The Amherst native-turned-FBI special agent died Tuesday after a long struggle with cancer, leaving behind a legacy that stretched from his Boy Scout troop in Virginia to colleagues in Moscow, London and Taipei.

A graduate of Amherst Central High School and the University at Buffalo, Mr. Mikulski, 50, developed an early interest in computers that led him to a career with the FBI and its Cyber Crime Task Force in Washington, D.C.

“He represented the U.S. all across the world,” said his brother David. “He was on the cutting edge of using computers and technology to fight crime.”

It was a job that put him in the middle of several post Sept. 11 terrorism investigations, including the Lackawanna Six case in Buffalo.

He later used his skills as part of the FBI’s efforts to modernize its hazardous waste response teams.

A former Army Reservist, Mr. Mikulski was remembered Saturday by more than 300 fellow agents, friends and family as part of a memorial ceremony in Washington.

The crowd also included members of his Boy Scout troop. That was a tribute, David Mikulski said, to his brother’s genuine interest in others.

“He was a great agent, but he also touched people’s hearts,” he said.

His survivors include his son, Scott; two brothers, Paul and David; and a sister, Lynn Conway.

A Mass of Christian Burial will be offered at 9 a.m. Thursday in St. Gregory the Great Catholic Church, 200 St. Gregory Court at Maple Road, Amherst.