After split up of the group, Jassy went on to writing music and producing a number of international acts such as Akon, Keith Sweat, Oxlade, Alkaline, YG Marley, Chloe Bailey, Ashley Tisdale, Britney Spears, Sean Kingston, Afro B, Snoh Aalegra, Arash, Eve, No Angels, Mohombi, Djodje, David Carreira,Darin, Navigators, Charice, Heidi Montag, Bayanni, singah, AV, Jizzle, Loreen, Petter, 1.cuz, Ant Wan and many more.

He also co-wrote "Goodbye to Yesterday" and "Back Off" by No Angels, "Love Struck" by VFactory", "Runaway" and "Karma" for Darin, "Body Language" for Heidi Montag and "Pyramid" for Charice.

The coroner testified that it was either this kick or the resulting fall that broke Osnes's skull and caused his death.

[8] On February 1, 2010, he was convicted of second-degree murder but not guilty of assault with a deadly weapon and leaving the scene of an accident.

[11] On March 27, 2020, California Governor Gavin Newsom commuted Jassy's sentence to time served and he was released from prison on parole.

[13][14] This prompted David Jassy already in San Quentin to volunteer in a musical program launched in 2015.

He encouraged the talented youth imprisoned on various offences to channel their feelings through music and lyrics they composed, thus serving as a rehabilitation and hopefully serve as a tool to help prevent other youth to fall into the same path through listening to a more genuine output of music from those actually incarcerated rather than the gangsta rappers they are accustomed to hear who just glorify prison life.

[16] Jassy says the mixtape released has caught the attention of music industry celebrities like Common and DJ Khaled, who are now supporters of the program.

Jassy is part of the hip-hop band, Contagious, one of four official inmate music groups at San Quentin that perform at various yard shows, graduations and events inside the prison during the year.

[17] Jassy is the primary songwriter and front man of the band, that also includes convicted prisoners Paul Comauex (vocals), Lee Jaspar (on guitars), Kevin Sawyer (on keyboards) and James Benson (on drums).

[20] He also created beats for the acclaimed prison podcast Ear Hustle producing music from an influx of younger men who came into San Quentin.