Some interesting related links:
Suicide often not preceded by warnings
What makes a loving husband take his life without any warning?
'Overwhelmed' mom spent THREE DAYS driving around with her children before committing suicide in a Target parking lot leaving them unharmed (source)
Gary Speed's father gives his most candid interview about his battle to understand his son's death (source)
Death of Bill Sparkman (wikipedia)
A case with some interesting similarities:
Kelowna woman's body found in Columbia River in Washington State (cbcnews)
If it was suicide (I'm not saying it was), the most similar case that comes to mind is that police officer at Fox Lake, Illinois. That event happened in early September, 2015. There is apparently a phenomenon called the Werther effect, where a highly publicized event, including suicide, is copied by others. However Rita life doesn't seem to have ANY similarities to that officer.