Longman Dictionary of Contemporary English
suicide pact
noun
EXAMPLES FROM CORPUS
▪ At the moment they don't know whether this was an accident, a murder or a suicide pact.
▪ Desperate and afraid, they formed a suicide pact.
▪ Detectives are investigating whether it was an accident, a murder or a suicide pact.
▪ Lowestoft is a town twinned with nowhere, although it is considering a suicide pact with Basildon.
▪ So they joined in a suicide pact which would rid them for ever of parental domination.
Wiktionary
suicide pact
n. An agreement between two or more people to commit suicide
WordNet
suicide pact
n. an agreement by two or more people to commit suicide together at a given place and time; "the two lovers killed themselves in a suicide pact"
Wikipedia
Suicide Pact
Suicide Pact is the debut album by Los Angeles-based band JJAMZ, released by Dangerbird Records on July 10, 2012. It was released on CD and vinyl on July 17, 2012. A free download of the single, "Heartbeat" can be obtained on their website.