A sixth worker has died after the tragic April 2 explosion at the Tesoro refinery in Anacortes, Washington.

Lew Janz, 41, a long-time union member who had become a supervisor, died Monday night.

The United Steelworkers (USW) union expresses its deep sympathy to Janz' family and to all the families and co-workers of the employees killed and severely injured in the explosion and fire.

Three operators killed in the blast and fire were Matthew C. Bowen, 31; Darrin J. Hoines, 43; and Daniel J.
Aldridge, 50. Operators Kathryn Powell, 29, and Donna Van Dreumel, 36, died of their burns later at the hospital. All were USW members.

Employee Matt Gumbel, 34, was severely burned and remains hospitalized. Gumbel is an operator who is a USW member.

Click here to watch USW International President Leo W. Gerard discuss the need to stop needless worker deaths and injuries on MSNBC. Click here for the USW's report on its previous warnings about refinery safety.