Wells joins the Cougar staff as a volunteer coach.
Former Washington State catcher and minor league manager Jim Horner returns to WSU.
Spencer will oversee the Cougar pitching staff.
Washington State baseball had five players selected in the 2015 Major League Baseball Draft.
Junior reliever Matt Bower is the fifth Cougar taken in the 2015 MLB Draft.
Catcher P.J. Jones is the second Cougar drafted by the Mariners in 2015.
Pistorese was a two-time All-Pac-12 selection for the Cougars.
Infielder Ian Sagdal was drafted in the 16th round by the Nationals Wednesday.
Wes Leow was named to the 2015 Pac-12 Conference Baseball All-Academic First Team.
The righthander Sam Triece led the Cougars with 31 appearances in 2015.
The former Cougar lefthander will be in a Miami Marlins uniform Monday.
Lees helped lead teams to 10 NCAA Tournaments, two NCAA titles in last 14 seasons