Heather Mack pleaded guilty on Friday in the U.S. to ... she became very angry and threatened to kill the couple’s unborn baby — and tried to strangle Schaefer for nearly 30 seconds.

Agung Parameswara/Getty Heather Mack, the Chicago woman who ... angry and threatened to kill the couple’s unborn baby. He also claimed Mack’s mother tried to strangle him for nearly 30 seconds.

“Suitcase Killer” Heather Mack is among a group of women claiming to have been sexually abused by a former corrections officer at Chicago’s Metropolitan Corrections Center, The Post can revea ...