Two men were killed in a crash on i-94 near mile marker 43, just three miles east of the Michigan City exit.
The victims were Michael Van Der Linden of Van Buren Township Michigan and Juan Nelson of Portage.
When police arrived at Van Der Linden home to notify his family of the news, three people were found dead inside.
The three were identified as his wife, Linda, who was strangled and stabbed and his two children, Julien and matthew who were stabbed.
Van Der Linden is suspected in the deaths, but police don't have anything to prove that and are continuing to investigate.
Sources say there may have been a strain in the marriage recently and he was in the process of moving out.
Stay tuned to NewsCenter 16 as we continue to follow the very latest on this still developing story.