Gertrude Menacher, 37, vanished from Hallandale, Florida after being seen on March 7, 1981, with her daughter Angela DeLawder, boyfriend Charles Gibson, and DeLawder’s boyfriend Ivan Gutierrez. The four were last known to have met for dinner and then disappeared together; none have been heard from since.

In the days before the disappearance Menacher phoned her other daughter, Robin Patton, on March 4 saying she planned to leave and would send plane tickets and directions. Letters and $100 arrived for Patton on March 6. Shortly after the group vanished, Gibson’s car turned up abandoned at Miami International Airport. Gibson had a criminal history and was on lifetime parole; he and Menacher were wanted for questioning in the January 1981 murder of Harvey Michael McElroy, whose burned body was recovered that month. Investigators have considered that knowledge of McElroy’s death could have led to the group being killed, or that they went into hiding, possibly overseas in Germany or Colombia.

What information can readers share about any of the four or sightings around March 1981 that might move this cold case forward?