PHOENIX (AP) — Police say a 31-year-old man has been arrested and faces charges in the death of an Arizona couple who were found tied up and burned beyond recognition.

Investigators said at a Tuesday afternoon news conference that four other people were also arrested in the case.

Earlier Tuesday, family and friends gathered in a packed downtown Phoenix theater for a memorial service for Lawrence and Glenna Shapiro.

The bodies of the well-to-do philanthropists in their 70s were discovered on Jan. 30 in their stylish home in the affluent Phoenix suburb of Paradise Valley.

Their murders are the first in Paradise Valley since 2004 and have shaken neighbors, police and the town mayor.