Morrissey was named the 2011 "Individual Community Ally of the Year" by the Denver Gay and Lesbian Chamber of Commerce.

The award honors supervisors for supporting staff during absences for Reserve training and deployments in foreign countries.

Morrissey's grandfather served as the United States Attorney of Colorado under presidents Franklin Roosevelt and Harry Truman.

[6] In 1999, Morrissey was sworn in as a District Attorney for Boulder County, Colorado, to provide aid in the thirteen-month-long grand jury investigation into the death of Jon Benet Ramsey.

In 2003, Morrissey, Denver Police Department Crime Lab Director Dr. Gregg LaBerge, and Lt. Jon Priest from the Denver Police Department pioneered the Cold Case Project that utilizes DNA to solve cold cases.

[6][10] After leaving the Denver District Attorney's office due to term limits, Morrissey co-founded United Data Connect, a company that uses DNA to solve cold case rapes and homicides through familial DNA searching and forensic genetic genealogy analysis.

[11] In 2008, Morrissey was the first District Attorney in the United States to develop and implement familial DNA searching to solve cold cases.

[14] Morrissey's advocacy for the use of familial DNA searches across the United States has included an interview on 60 Minutes, debate in the New York Times, and numerous national speaking engagements where he offers free familial search software to other law enforcement agencies.

[16] Morrissey is the President of the Board of Directors for the National Forensic Science Technology Center in Tampa, Florida.

[18] Morrissey is on the Board of Directors of the Friends of the Haven, a Colorado non-profit that provides care for the infants of women going through drug treatment.

[19] Morrissey is on the Advisory Board of the Porter Billips Leadership Academy, a Colorado non-profit that's mission is to academically challenge students who are high achieving, yet possibly at risk of falling through the cracks.