Today begins the trial of a man accused of killing his 4-year-old son in 1985 at his Tahoe Keys residence.

Alexander Olive’s body has never been found.

Ulysses Roberson has been in the Placerville jail since being extradited from a Washington prison in 2003.

Blood at the South Lake Tahoe house led authorities to arrest Roberson. DNA tests showed the blood was that of the boy’s.

The trial is expected to last for months.

Roberson could face life in prison without the possibility of parole if the jury finds him guilty.