“Marriage Killer” (*1/2 out of four) was a sour thriller about a happily married couple (Jeremy London and Barbie Castro) who meet a sexy stranger (Kristen Renton) who convinces them to attend a singles club and soon she leeches onto them and immerses herself in their family dynamics driving them apart and turning their lives upside down. Renton is good in the lead but script grows more ridiculous by the minute, especially in its final half-hour when it really goes off the rails. Yet another “Fatal Attraction” wannabe that’s a fatal waste of time and talent.