MISSOULA, Mont. -

Missoula County sheriff deputies have arrested two people and are looking for two more believed to be involved in the death of a transient whose body was found in the Clark Fork River in Missoula.

Sheriff's spokeswoman Paige Pavalone says officers arrested 21-year-old Kenneth D. Hickman on suspicion of aggravated assault while Mechailiah Tembruell is charged with accountability for aggravated assault.

Officers have warrants charging 27-year-old Kevin Joseph Lino with deliberate homicide in the death of 36-year-old Gilbert George Berry. Berry's body was found in the river on Tuesday. An autopsy found he had been beaten and shot.

Officers are also seeking 27-year-old Angela Marchese, who is believed to be a witness in the case. Lino and Marchese are believed to be traveling with a pack of pit bulls in a white 2014 Ford Focus with temporary West Virginia license plates.