|Portrayed by||Ron Donachie|
|First Appearance||Series 8 Episode 4 (Read My Lips)|
|Last Appearance||Series 8 Episode 10 (Paradise Lost)|
|Cause/Reason||Assisted suicide after suffering from a terminal chronic pain illness - drug overdose administered by himself and bottle opened by Michael Byrne|
|Died||25 October 2012|
|Spouse(s)||Katherine Byrne (Deceased)|
|Sons||Michael Byrne (1972)|
William "Billy" Byrne was the father of Michael Byrne.
In Series 8 Episode 10 (Paradise Lost) Billy dies from a drug overdose administered by himself, however the bottle of pills was opened by Michael Byrne at Billy's request. Michael was later arrested for culpable homicide.