What to know about shaken baby syndrome as a man could be first in U.S. executed over it

Here's what to know about the highly scrutinized diagnosis ahead of Robert Roberson's scheduled execution

A Texas man this week could become the first person executed in the U.S. from a murder conviction tied to the diagnosis of shaken baby syndrome.

Robert Roberson, 57, is scheduled to receive a lethal injection on Thursday for the 2002 killing of his 2-year-old daughter, Nikki Curtis. Roberson has long proclaimed his innocence. His lawyers as well as a bipartisan group of Texas lawmakers, medical experts and others have argued his conviction was based on faulty scientific evidence and say new evidence has shown Curtis died from complications related to severe pneumonia.