Guillaume Gremy

Guillaume Gremy was a 37-year-old French man who murdered his estranged wife Émilie Hallouin on her 34th birthday by tying her to railway tracks in front of a high-speed TGV train. He remained on the tracks with her and allowed himself to be hit by the train, committing suicide. They died at 4:30am on June 12, 2017 when they were struck by a TGV heading to Beauvilliers, where the deceased were from, at 320kph. Hallouin had a 15-month-old child by Gremy and a second child from another man.

Source

 * Husband ties wife to train tracks in suspected murder-suicide - Nine.com.au