"48 Hours" examines the mysterious death of a beloved Texas cheerleader

"48 Hours" has the first in-depth look at the death of San Antonio cheerleader and college student Cayley Mandadi. Prosecutors allege she was beaten to death by her boyfriend, but the defense has other explanations as to how she could have died. "48 Hours" correspondent Peter Van Sant joins "CBS This Morning" with a preview of his report.