George Stammerjohan organized the Sacramento Chapter of the IPMS club.
He held meetings at his home next door (or very near) to John's house - Could DeAngelo have joined this chapter? He was an enthusiast, but where and with which affiliation?
John was murdered following a Sunday night ( early Monday morning) after returning home from a late cinema movie with his wife.
The meetings were initially held every third Sunday. JD's murder was on the 2nd Sunday. Could meetings have been moved to twice/month or met early that month? Thanksgiving influence time change?
Credit: MurderInc, https://murderincorp.wordpress.com/2020/08/06/vicki-pyrskalla/ retrieved 2/21/2021
Rancho Cordova Modelmasters club?