20/20

Meddler or Murderer? (Season 49, Episode 12)

TV Episode | 120 min | Documentary, News

A wealthy grandmother goes on trial, accused of being the mastermind behind a murder-for-hire of a family member;

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Release date

Jan 2, 2026 (United States)

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Cast	+ Add Cast
10 cast members

Name	Known for
David Muir Self - Co-Host Self - Co-Host See fewer	World News Tonight with David Muir (1953)
Deborah Roberts Self - Co-Host Self - Co-Host See fewer	The Wayne & Shuster Comedy Special (1967)
Charles Adelson Self - Convicted of Murder / Self - Brother of Wendi Adelson / Self - Son of Donna Adelson (archive footage) (as Charlie Adelson) Self - Convicted of Murder / Self - Brother of Wendi Adelson / Self - Son of Donna Adelson (archive footage) (as Charlie Adelson) See fewer
Donna Adelson Self - Convicted of Murder / Self - Mother of Wendi Adelson (archive footage) Self - Convicted of Murder / Self - Mother of Wendi Adelson (archive footage) See fewer	Court Junkie (II) (2016)
Wendi Adelson Self - Former Wife of Daniel Markel (II) (archive footage) Self - Former Wife of Daniel Markel (II) (archive footage) See fewer
Sigfredo Garcia Self - Convicted (archive footage) Self - Convicted (archive footage) See fewer
Katherine Magbanua Self - Convicted (archive footage) Self - Convicted (archive footage) See fewer
Daniel Markel Self - Murder Victim in 2014 (archive footage) Self - Murder Victim in 2014 (archive footage) See fewer
Matt Murphy Self - ABC News Legal Contributor / Self - Former Prosecutor Self - ABC News Legal Contributor / Self - Former Prosecutor See fewer	I Escaped My Killer (2015)
Luis Rivera Self - Convicted Self - Convicted See fewer	20/20 (1978)