Sean Nicholson, the eldest grandchild of Hollywood legend Jack Nicholson, is facing serious legal trouble after allegedly assaulting his ex-girlfriend, leaving her with severe facial injuries.

The 29-year-old techno producer, who performs under the name Cutter Mattock, was arrested on August 5 following a July 23 incident at his Venice, California apartment.

According to a police report obtained by People, Sean – who is the son of Jack’s daughter Jennifer Nicholson -is accused of knocking 28-year-old Elizabeth Lawlor unconscious during an altercation that broke her tooth.

Elizabeth later posted a photograph of her injury on Instagram with the caption: ‘This summer gave me PTSD.’

Authorities say Sean grabbed Lawlor by the neck and head during a heated argument, throwing her into a hard

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