State Rep. Marko Liias has moved from the House to the Senate to replace Paull Shin, who retired earlier this month.

Liias, a Mukilteo Democrat who was appointed to the House in 2008, was sworn in Wednesday.

“Sen. Paull Shin left an enormous pair of shoes to fill, and I’m honored to have the opportunity to serve the constituents of the 21st District in the Senate,” Liias said in a statement. “I look forward to working on the 21st District’s priorities: expanding economic opportunity and creating jobs, investing in the next generation of students by fully funding our education system, protecting our environment and building a transportation system that works for all.”

Shin, a fellow Democrat who was elected to the Senate in 1998, cited Alzheimer’s disease as a factor in his retirement after a career that came after growing up as an orphan on the streets of Korea and being adopted at age 16 by an American soldier.

In the House, Liias has focused on transportation issues and anti-bullying legislation. He is one of a half-dozen gay lawmakers.

The Snohomish County Council made the appointment Tuesday. It had been expected.

To take Liias’ seat in the House, the council appointed Lillian Ortiz-Self, a middle-school counselor and member of the state Commission on Hispanic Affairs.

Both plan this year to seek full terms in the district, which includes Edmonds, Lynnwood and southern portions of Everett.

Brian M. Rosenthal: 206-464-3195 or brosenthal@seattletimes.com. On Twitter @brianmrosenthal