SEATTLE -- One of the accomplices who helped set fire to the UW Horticulture Building in 2001 was sentenced to prison Tuesday.

A federal judge gave Lacey Phillabaum a three year prison sentence, and three years' probation. She is also required to pay $6.1 million in restitution.

Phillabaum, a member of the group Earth Liberation Front, made a plea with prosecutors to plead guilty and give information about the fire and how ELF works in return for a lighter sentence.

In March, a federal jury found Briana Waters guilty of two counts of arson for being the lookout in the fire. She was the only one of the five indicted to plead not guilty. She was sentenced to six years in federal prison and pay $6.1 million in restitution.

Another accomplice, Jennifer L. Kolar, 33, of Seattle was convicted and sentenced in July to five years in prison and was ordered to pay more than $7.1 million in restitution in connection with the fire.

A fourth accomplice, Justin Solondz, 29, also faces arson charges, but is a fugitive. The fifth, William C. Rodgers, committed suicide Dec. 22, 2005, while being held in the Coconino County Jail in Prescott, Ariz.

The fire, which destroyed the plant research center, was one of at least 17 fires set by radical activists with the Earth Liberation Front and the Animal Liberation Front from 1996 to 2001.

The university rebuilt the horticulture center at a cost of $7 million. It was targeted because the ELF activists mistakenly believed researchers there were genetically engineering poplar trees.