Question: Who played in both Cold Case and Grey's Anatomy?

Context paragraphs:
Mark Pryor (author): Mark Pryor (born May 8, 1967) is a British mystery writer and Assistant District Attorney for Travis County, Texas.  He is best known for his mystery novels featuring Hugo Marston, a former FBI agent from Texas, and now head of security at the U.S. Embassy in Paris.  Pryor is also the author of the nonfiction book, "As She Lay Sleeping," based on the 1985 cold case murder of Natalie Antonetti (the mother of Johnny Goudie) that he successfully prosecuted in 2011.  He has appeared on CBS News' "48 Hours" and Discovery Channel's "Discovery ID: Cold Blood" discussing the case.  He is also the creator of the true-crime blog D.A. Confidential.

Cold Case (season 1): Season one of Cold Case, an American television series, began airing on September 28, 2003.  Cold Case is a drama about Lilly Rush, an enigmatic and highly effective detective on the Philadelphia Homicide Squad.  Rush's instinctive understanding of the criminal mind and her singular passion for uncovering the truth makes her the perfect fit for investigating cold cases, yester-crimes that have remained unsolved – some only a few months old, others going back decades.  Rush and her team use their wits to take on aging evidence and witnesses with buried secrets, uncovering fresh clues, digging into old wounds and doggedly pursuing the truth.  Joining Rush on her mission are a team of talented detectives: Scotty Valens, Rush's confident and street-smart partner; Nick Vera, rough around the edges but a sharp investigator; Will Jeffries, an experienced veteran who's been around the block; Kat Miller, no-nonsense and resourceful; and Lieutenant John Stillman, Rush's mentor and sometime father figure.  With their assistance, Rush is able to take on the toughest cases, giving voice to victims unable to speak for themselves – making sure none is ever forgotten.  Season one regular cast members include Kathryn Morris, Danny Pino, John Finn, Thom Barry and Jeremy Ratchford.  In 3 episodes, Justin Chambers had played Chris Lassing, Lilly's partner on the Philadelphia Homicide Squad, but left the show to star as Alex Karev in ABC's hit drama show "Grey's Anatomy".

Nick Vera: Detective Nick Vera is a fictional character in the CBS crime drama "Cold Case", portrayed by Jeremy Ratchford.  He was a Philadelphia homicide detective and part of the cold case squad.

Cold Case Love: "Cold Case Love" is a song recorded by Barbadian singer Rihanna for her fourth studio album, "Rated R" (2009).  It was written and produced by The Y's (Justin Timberlake, Robin Tadross and James Fauntleroy II).  Following Chris Brown's assault on Rihanna, she started working on the sound of her new album.  Timberlake who co-wrote "Cold Case Love" labeled the sound of Rihanna's new project as a step forward for the singer.  In February 2010, Rihanna admitted that the song's lyrics are about her complicated relationship with Brown.

History Cold Case: History Cold Case is a British documentary television series in which scientists use modern forensic techniques to investigate ancient remains.  Two series of "History Cold Case" aired on BBC Two between 6 May 2010 and 21 July 2011.  The television series is recommended for age 17 and above due to graphic images and maturity.

Alex Karev: Alexander "Alex" Michael Karev, M.D. is a fictional character on the ABC television series "Grey's Anatomy", portrayed by actor Justin Chambers.  Introduced as a surgical intern at the fictional Seattle Grace Hospital, Karev eventually obtained the position of resident, later becoming a pediatric surgical fellow.  His relationships with colleagues Meredith Grey (Ellen Pompeo), Cristina Yang (Sandra Oh), Izzie Stevens (Katherine Heigl), and George O'Malley (T. R. Knight) formed a focal point of the series.

Donal MacIntyre: Unsolved: Donal MacIntyre: Unsolved is a British crime reality series in which investigative journalist and self-proclaimed criminologist Donal MacIntyre investigates a number of well noted 'cold cases', for which the police have never been able to reach a conclusion.  Working alongside a self-assembled cold case team, MacIntyre revisits each case by re-interviewing witnesses, investigating officers and reviewing physical evidence in the hope that "fresh eyes" can release new information and possible theories, which could lead to closure for the family and friends of each of the victims.  The series began broadcasting on CBS Reality on 11 October 2015.  A total of ten episodes have been broadcast to date.

Surface anatomy: Surface anatomy (also called superficial anatomy and visual anatomy) is the study of the external features of the body of an animal.  In birds this is termed "topography".  Surface anatomy deals with anatomical features that can be studied by sight, without dissection.  As such, it is a branch of gross anatomy, along with endoscopic and radiological anatomy.  Surface anatomy is a descriptive science.  In particular, in the case of human surface anatomy, these are the form and proportions of the human body and the surface landmarks which correspond to deeper structures hidden from view, both in static pose and in motion.

John Stillman (Cold Case): Lieutenant John Stillman is a fictional character in the CBS crime drama Cold Case, portrayed by John Finn.  He is the chief of the homicide division in Philadelphia also the commander of the cold case squad.

Lil' Miss murder: The Lil' Miss murder is the name given to the murder case of Lisa Marie Kimmell (July 18, 1969 - April 2, 1988), who disappeared while on a trip home from Colorado to Billings, Montana.  Her murder would remain a cold case, until DNA profiling eventually linked a prison inmate to her kidnapping, rape and murder some 14 years later, which led investigators to the most vital piece of evidence in the case: Kimmell's missing car, which bore the distinctive personalized license plate that gave the case its name, "LIL MISS".

Supporting paragraphs: Cold Case (season 1) Alex Karev
Answer: Justin Chambers