lead guitar on "Render My Prey" on Spawn of Possession's album Noctambulant. In 2008 played guitar on the song "Race Against Disaster" on Jeff Loomis's debut solo album Zero Order Phase. In the same year he made a guest solo appearance on Kataklysm's album Prevail. Assault incident On December 10, 2018, O'Brien was arrested in Tampa for burglary of a house in the 4700 block of Windflower Circle near the Northdale Golf and Country and for assault on a responding deputy. Reports showed that around 6:57 p.m., he entered a home without permission from its two unidentified occupants. After one occupant told him to leave, O'Brien pushed a woman to the ground, left the house and hid in the property's backyard until police arrived. A responding deputy gave him orders; instead of complying, charged at the deputy with a knife. The deputy then tased him, taking him into custody afterward. He was booked into the Hillsborough County Sheriff's Office on charges of burglary with assault or battery and aggravated assault on a law enforcement officer, and was being held without bail. The burglarized home is in the same area of a golf course as where a house fire broke out about the same time at 16311 Norwood Dr., the house O'Brien was renting. It was not immediately clear if the fire was connected to his arrest. At O'Brien's court appearance on the morning of December 11, he wore an anti-suicide vest with his wrists and ankles chained together. His bail was set at $50,000 and was told by a judge that he would need to pass a drug test to see if he could be bonded out of jail. O'Brien could face up to 30 years in prison just on the charge of aggravated assault on a law enforcement officer with a deadly weapon. The burglary charge could see a fine of up to $10,000 and a maximum of life in prison. Flamethrowers, numerous weapons and ammunition that had caught fire and exploded were recovered inside O'Brien's home. One neighbor said that he seemed "just like a regular neighbor. Get out of the car, go right into the house. That's about it." Another neighbor was terrified by the incident, but was thankful that the fire crew came in time to put the flames out before spreading to other homes. A crowdfunding campaign for O'Brien was launched by drummer Paul Mazurkiewicz's