A man accused of lacing heroin with elephant tranquilizers over the summer was acquitted on Thursday due to lack of evidence, the Fifth Judicial District Attorney's Office announced.

Samuel Brunelus was arrested in July in Florida on suspicion of lacing heroin with elephant tranquilizers - called carfentanil - that led to the deaths of two people in Eagle County in March.

A multi-agency investigation that spanned months led up to the arrest.

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Brunelus faced two counts of manslaughter, including charges for distributing a schedule-II controlled substance.

He has been acquitted of all charges.

The Fifth Judicial District covers Summit, Clear Creek, Lake and Eagle counties in Colorado.