There are 4 families with kids who are now missing a parent. Donations for the families can be made to:
Lakewood Police Independent Guild
PO Box 99579
Lakewood, WA 98499
Put something in the memo section of your check to let them know where you want your donation to go. (Slain officers, etc..)
There is also a way you can donate online.
http://www.policeone.com/police-heroes/articles/1971152-Information-from-the-Lakewood-Police-Independent-Guild-Charitable-Fund/
The four murdered police officers collectively had nine children.