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Sociopath Role: Actor's Surprising 'Blue Bloods' Turn
22 Feb
Summary
- Mark Deklin plays Donnie Hassett, a criminal's former associate.
- Hassett's cooperation with Erin Reagan had unintended murder charges.
- Deklin describes the sociopath role as a lovely departure from typical parts.

In "Blue Bloods," actor Mark Deklin has taken on the role of Donnie Hassett, a character who first appeared in Season 10, Episode 17.
Hassett, a former underling to a notorious criminal, agreed to cooperate with Erin Reagan's murder investigation in exchange for immunity, a compromise Reagan deemed worthwhile.
Hassett reappeared in Season 11, Episode 3, seeking to assist Erin again. However, his actions had unintended consequences, resulting in him facing a murder charge.
Deklin, known for his television and voice acting work, described playing Hassett as a "lovely departure" due to the character's sociopathic nature, which is outside his usual roles.




