Dr. Kevin Collins (as played by Jon Lindstrom on General Hospital)
* Had a rivalry with Mac Scorpio until 1996.
* Had a twin brother, Ryan Chamberlain, who was a serial killer.
* Stalked and kidnapped Felicia Jones after suffering a mental breakdown.
* Wrote a bestselling murder mystery General Homicide.
* Through hypnosis was able to get Alexis Davis to remember the name of Sam's father.
Jon Lindstrom (1994 - present)
Psychiatrist Dr. Kevin Collins came to Port Charles in 1994 to rehabilitate his identical twin brother Ryan Chamberlain, a serial killer. Kevin met Lucy Coe and eventually they started dating. Kevin told Lucy that their mother had molested Ryan, and Kevin had decided to pretend he was Ryan to learn what their mother was doing. Lucy stood by Kevin when Felicia Jones brought charges of stalking and kidnapping against him after he suffered a mental breakdown. She later dropped the charges, but Kevin's medical license was suspended.
While he was unable to practice medicine he wrote a bestselling murder mystery, General Homicide, based on people who worked at General Hospital. Greg Cooper, a disgruntled former resident who the Quatermaines had let go from his internship, used the book as a blueprint for murder.
Kevin later proposed to Lucy and they decided to have a double wedding with Felicia and Mac. However, that failed when Kevin learned about Lucy's involvement in the car accident that left Serena Baldwin blind.
Kevin began treating a woman named Livvie who was having numerous nightmares of drowning. They learned that Livvie was the daughter of Grace and Kevin was her father. Kevin was suspicious that his daughter Livvie was dating a vampire named Caleb Morley.
Kevin and Lucy were once again married, and left town.
In January 2013, Alexis Davis asked Kevin to return to Port Charles after Lucy attacked John McBain thinking he was the vampire Caleb Morley. Kevin revealed that Lucy's involvement with vampires was just a delusion that ended their marriage, and he never had a daughter named Livvie.
Through hypnosis, he was able to get Alexis to remember the name of Sam's father.
Laura Spencer (engaged - October 31, 2017)
Victor Collins (father)
Ryan Chamberlain (twin brother; deceased)
Livvie Locke (daughter with Grace on "Port Charles")