James Sikking, star of 'Hill Street Blues' and 'Doogie Howser, M.D.', has died at age 90 due to complications from dementia, his publicist confirmed Sunday evening.

Sikking, whose nuanced performances as Lt. Howard Hunter and Dr. David Howser enchanted television audiences, had a diverse career featuring roles in iconic shows like 'Mission: Impossible' and 'Hawaii Five-O.' His death marks the end of an era for fans who cherished his depiction of depth and complexity in numerous beloved characters. Sikking's legacy also includes an Emmy nomination and contribution to multiple charity events, underscoring his enduring influence both on and off the screen.

James Sikking's publicist, Cynthia Snyder, confirmed the actor's death in a statement released Sunday evening. The statement revealed that Sikking had passed away due to complications from dementia.

Born on March 5, 1934, in Los Angeles, Sikking was the youngest of five children. He grew up in a family that valued education and creativity, setting the stage for his future career in the performing arts. He later graduated from the University of California, Los Angeles (UCLA) in 1959, laying the foundation for his enduring legacy in television and film.

Sikking's major breakthrough came with his role as Lt. Howard Hunter on the critically acclaimed television series 'Hill Street Blues.' His portrayal of the meticulous and sometimes overly zealous SWAT team leader earned him significant recognition, including an Emmy nomination for outstanding supporting actor in a drama in 1984. Sikking's character was notably inspired by a drill instructor he had encountered during basic training, which added a layer of authenticity to his performance.

He continued to captivate audiences with his role as Dr. David Howser, the father of the titular character on 'Doogie Howser, M.D.' His chemistry with the young Neil Patrick Harris, who played Doogie, was a cornerstone of the show, which chronicled the challenges of a teenage medical prodigy.

Beyond these iconic roles, Sikking had an extensive career in television, making guest appearances on numerous popular series. He appeared in 'Mission: Impossible,' 'M.A.S.H.,' 'The F.B.I.,' 'The Rockford Files,' 'Hawaii Five-O,' and 'Charlie's Angels,' among others. His versatility allowed him to seamlessly transition between genres, from action and drama to comedy.

In addition to his television work, Sikking also made noteworthy contributions to film. One of his notable film roles was in 'Star Trek III: The Search for Spock,' where he portrayed Captain Styles. He also appeared in 'Fever Pitch,' 'Made of Honor,' and other projects, showcasing his broad range of acting skills.

Sikking's early ventures into acting included an uncredited part in Roger Corman’s 'Five Guns West' and a bit role in an episode of 'Perry Mason.' These early experiences helped him build a solid foundation for his later successes in the industry.

In his personal life, Sikking married Florine Caplan. The couple had two children and four grandchildren, and he often expressed pride in his family's accomplishments. Despite his busy career, Sikking remained dedicated to his family, balancing his professional and personal life with grace.

Even in his later years, Sikking continued to work in the entertainment industry. He had guest spots on shows like 'Curb Your Enthusiasm' and 'The Closer' and appeared in films such as 'Just an American' in 2012. His last on-screen appearance was in 2012, marking the end of a vibrant and impactful career.

Sikking also actively participated in numerous charity events throughout his life. He was a recognizable face at celebrity golf tournaments and community health center inaugurations, demonstrating his commitment to giving back to the community.

James Sikking's passing marks a significant loss in the world of television and film. He leaves behind a legacy of memorable performances that have left an indelible mark on the industry. His contributions extended beyond the screen, as he was also known for his charitable endeavors and dedication to his family. Sikking will be remembered not only for his talent and versatility as an actor but also for his generous spirit and the positive impact he made on those around him.