What is moral/ethical often conflicts with the State Statutes and also the US Constitution where it's not against the law to remain silent. However, when remaining silent, it is against the law to lie to police if questioned. (No evidence RP was anything but cooperative when LE showed at his door). Fortunately, they've upgraded RP's charges from abuse of a corpse to also include:
Police also added
alter, destroy or conceal a human corpse to Ramon's charges. His bond now sits at $600,000. Both are still in the Bexar County jail.
IMO, they're probably hoping to find additional evidence to charge RP with conspiracy charges pursuant to felony murder laws.
Added charges for RP