Sturgeon's husband was arrested and then released without charge pending further investigation in April.
The judge described the attack as "unimaginably wicked and indeed medieval in their barbarity."
Instead of feeling down about it, the criminologist decided to solve the mystery.
Fawziyah Javed was 17 weeks pregnant when she was pushed off a cliff and killed
Yousaf will succeed Nicola Sturgeon as leader of the governing Scottish National Party (SNP).
Sturgeon said the brutality of modern politics took a toll and she could no longer commit to give "every ounce of energy" that the job entailed.
This means Scotland cannot hold a second referendum on independence without approval from the British Parliament.
"I could only think of Alfie and what would happen to him if he lost his mum."
"We want to make sure nobody else goes through what we have."
