A Colorado father accused of killing his pregnant wife and two young daughters reportedly stuffed the girls' bodies in oil tanks on his employer's property.  

Mourners gathered on Friday for a vigil outside the Colorado home Chris Watts once shared with his pregnant wife and two young daughters. 

Watts is behind bars on suspicion of killing his wife Shanann and their daughters, 3-year-old Celeste and 4-year-old Bella.

The two young girls were reportedly strangled and their bodies were found inside tanks filled with crude oil on the property where Watts worked.

His wife's body was found nearby.

A day before authorities discovered the bodies of his wife and children, Watts pleaded for their safe return in a TV interview.

Watts is expected to be formally charged on Monday on three counts of first-degree murder and three counts of tampering with physical evidence.

He remains behind bars at the Weld County Jail. 

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