Tragic mom-to-be Laci Peterson died while she slept in her bed — smothered to death with a pillow held over her face by her husband Scott.

That’s the shocking scenario presented by detectives to prosecutors – and revealed for the first time exclusively by The ENQUIRER.

The issue that goes on sale Friday retraces the steps police believe Scott took after the murder, tells how a black maternity blouse, a pillowcase and a bloodstain have become crucial clues in the case … and much more.