A 47-year-old Renton man whose speedboat slammed into an unlit sailboat at night on Lake Washington in July 2014, killing a 33-year-old Seattle school teacher, was sentenced Sept. 4 to 30 months in prison.

Richard Anthony Hicks was convicted in July of one count of homicide by watercraft and two counts of assault by watercraft by a King County Superior Court jury.

Hicks was under the influence of alcohol when the motorboat he was piloting collided with the sailboat that was moving slowly toward Leschi Marina in Seattle, according to prosecutors.

Hicks faced a standard prison term of 51 to 68 months but Superior Court Judge Carol Schapira sentenced him to what’s considered an exceptionally low prison term. She’ll officially explain her reasons in what’s called a Findings of Facts and Conclusions of Law to be filed at 1:30 p.m. Sept. 21.

The defense had argued for an exceptional sentence below the standard range because the sailboat’s operator also had been drinking, according to testimony.

The prosecution did not recommend the lighter sentence. Hicks also was fined $800, plus any restitution that’s ordered at a later hearing.

Hicks was sentenced to 20 months for each of the assault convictions, but those will be served concurrently with the 30-month sentence for homicide by watercraft.

There was no wind to power the 22 1/2-foot sailboat late on July 16, 2014, so it was powered by an electric trolling motor that moved it at 1 or 2 knots an hour, according to charging documents.

A passenger on the sailboat, Melissa Protz, 33, died in the collision and two other passengers on the sailboat were injured, including the sailboat’s operator, Shreedhar Madhavapeddi.

Protz taught sixth- and seventh-grade biology at Assumption-St. Bridget School in Seattle.