Alden Parker is a former FBI Special Agent-turned-NCIS Supervisory Special Agent who as of 2022 is the new team leader of the NCIS Major Case Response Team which operates out of the Navy Yard in Washington D.C.
Alden Parker is the son of Roman Parker and an unnamed woman. They moved from Chicago to Philadelphia when Alden was 14 years old. He met and befriended Billy Doyle, who was the son of a local criminal. Out of boredom, the two of them stole hubcaps from a local car lot at least three times in the span of a month. They got caught and were sentenced to Juvenile Hall for a few months in 1975.
The experience was enough to scare Parker straight, especially as he needed Billy to keep him safe in Juvie.
He later went on to join the FBI where he had a long career before getting fired.
At some point he met and began dating Vivian Kolchak. They got married in 1997 and divorced in 2005.
NCIS Season 19
NCIS Season 20
or a more detailed list, see Alden Parker/List of Appearances.