DENVER — A Wisconsin man has been found guilty of murdering his wife during a train trip nearly seven years ago, a crime that has haunted a family waiting for justice. Angelo Mantych, 45, was convicted of first-degree murder on Friday for the suffocation death of Marina Placensia, 28, on an Amtrak train traveling from Wisconsin to Denver.
The tragic incident unfolded on August 30, 2016, when Mantych, Placensia, and her four children boarded the train. By September 1, when the train arrived at Union Station in Denver, Placensia was dead. According to the Denver District Attorney’s Office, Mantych initially claimed his wife was merely sleeping. He reported that when he attempted to rouse her, she did not respond, prompting him to seek help from others on the train.
Investigators noted multiple bruises on Placensia’s body that appeared to be consistent with an assault, though no single injury was deemed the cause of death initially. Mantych attributed the bruises to a screen door and heavy furniture, stating that they occurred during routine activities. However, Placensia’s relatives raised concerns about Mantych’s past behavior, revealing a history of domestic abuse that had been reported to authorities prior to the incident.
A former neighbor confirmed these allegations, stating that Mantych had physically assaulted Placensia shortly before their departure. Friends of Placensia also recounted conversations expressing her desire to escape from him, citing threats against her and her children if she left.
Despite extensive injuries—35 in total—officials were unable to determine a definitive cause of death at the time, ruling out conditions like liver disease noted in her autopsy. It wasn’t until 2022, when a suffocation expert was consulted, that authorities revisited the case. This expert’s evaluation concluded that Placensia had died from suffocation, classifying it as homicide.
This new evidence led to Mantych’s arrest and subsequent trial, which culminated in his conviction this week. He now faces a sentence of life in prison without the possibility of parole, with formal sentencing scheduled for January 9, 2026. The case serves as a stark reminder of the often-hidden layers of domestic violence and the urgent need for awareness and intervention.