Jaros Tolk was a joined Trill
Starfleet Officer serving during the 24th century.
He was born on Trill in 2337.
During his Starfleet Academy days, he specialized in Theoretical Physics.
By 2365 he held the rank of Lieutenant Commander and served as Chief Science Officer of the USS Fearless.
In 2367 he was assigned to the USS Hargrave as XO and Chief Science Officer, prior to the science vessel.
He was killed during the Battle of Heret IV. ("Battle of Heret IV")