“I want to make sure that something I did did not lead to an injustice,” Stier said in explaining why he is speaking out now.

Five other experts interviewed recently for this story said there are several possible explanations for Lincoln’s injuries and death, citing new information that has emerged. And if there was abuse, they said, it’s doubtful it can be tied to Hancock.

The new information was uncovered by journalism students from Northwestern University’s Medill Justice Project working in collaboration with the Wisconsin State Journal. The reporters obtained court, medical and police records and interviewed people connected to the case, including medical experts, lawyers and Hancock.

These medical experts — who did not testify at trial and who provided their expert opinions for no fee — said Lincoln could have suffered a blood clot in his brain or previous head trauma that began bleeding again.

They also disagreed on the timing of when the bleeding on Lincoln’s brain began — raising questions about how it could be linked to the five and a half hours he was in Hancock’s care.

The 4-month-old also had a heart virus, one that Stier and a second expert now say could have played a role in Lincoln’s death.