Jessica Tuck has signed on to Grimm.
The True Blood star will portray the mother of Claire Coffee's character Adalind on the new NBC series, Entertainment Weekly reports.
The episode, which is set to air later this season, is titled 'Love Sick'.
In August 2011, Tuck signed on to guest star in Castle as a murder suspect.
Tuck was promoted to a series regular for the fourth season of True Blood. She played vampire Nan Flanagan on the HBO series.
Grimm airs on Fridays at 9pm on NBC in the US
