This is an interesting case where investigation and prosecution is concerned. They did not have the necessary evidence but the suspect did a series of things after the murder that gave the Police enough evidence to seal his fate. They monitored him for 2 years and got what they wanted.
What an evil guy. Not only he murdered an entire family and kids, he also evicted his elderly in-laws from the house bought by the murdered victim. And the victim gave the only income for arsehole's family by giving his wife a job.
I hope somebody sort him out in Prison.