Suzanne Wright co-founded Autism Speaks with her husband, Bob Wright, in 2005. She died at home after a battle with pancreatic cancer.
A second man was arrested after a standoff following the killing, but it has not been determined he was involved. One other officer was wounded.
A 14-year-old is charged with attempted murder in the attack, in which she allegedly told her victim this was her first kill. The victim survived.
Democratic vice presidential pick Tim Kaine repeated his opposition to restoring public funds for abortion, breaking with Clinton and her campaign.
The Clinton campaign said a data program was accessed, but said no evidence has been found its internal systems were compromised.