Sean Gillebo, Interim Chief of Police
Sean Gillebo joined the Port of Seattle Police Department in August of 2012 as a lateral officer applicant. Sean started his career at Lynnwood Police Department where he served 11 years. There, he worked patrol, detectives, SWAT, and as an FBI Task Force Officer.
Since joining the Port of Seattle PD, he has served as a patrol officer, patrol sergeant, criminal investigations sergeant, patrol commander, criminal investigations commander, Deputy Chief of Operations and Services Bureau, and Interim Chief of the Department.
Before his law enforcement career, he was a member of the United States Marine Corp. reserves where he served 8 years.
Sean graduated with a Bachelor of Science in Organizational Leadership from the University of Charleston. Sean has also attended leadership courses at Northwestern University Center for Public Safety, Senior Management Institution for Police, and the FBI National Academy.
Alycia McKinney, Deputy Chief
Deputy Chief Alycia McKinney joined the Port of Seattle Police Department in January 2025, bringing with her more than a decade of public safety experience. She began her career with the Washington State Patrol before serving with the Bellevue Police Department, where she rose to the rank of Major.
In Bellevue, she led key operations including Patrol, SWAT, Traffic, and the Community Crisis Assistance Team (CCAT). She is especially proud of helping launch CCAT, a program that connects people in crisis with on scene mental health professionals with a focus on diversion, rather than jail or the emergency room. The program was so successful it earned permanent funding in 2023, making a lasting difference in how the community is served.
Deputy Chief McKinney holds dual master’s degrees in business administration and management & leadership, giving her a strong foundation for guiding teams and building partnerships. She also shares her knowledge as a leadership instructor at the state’s Criminal Justice Training Center.
Her colleagues describe her as a leader who values compassion, collaboration, and innovation. She is passionate about creating safer, healthier communities while supporting the officers who serve them. At the Port of Seattle, Deputy Chief McKinney looks forward to building strong connections with the community and ensuring the department continues to deliver exceptional public safety.
Darius Aldridge, Deputy Chief
Deputy Chief Darius Aldridge’s law enforcement career began in 2006 and includes service with the Port of Seattle Police Department, Gig Harbor Police Department and the Federal Way Police Department where he served in a variety of roles, such as Sergeant, Valley SWAT Command, Crowd Management Unit, Field Training Officer, and other specialty and investigative assignments. Prior to his appointment as Deputy Chief, Darius served as a Commander over Patrol Operations and the Counter-Terrorism Unit, and Co-Director of safety and security planning for FIFA World Cup at SEA.
Darius holds a master’s degree in criminal justice administration from Columbia Southern University, and a Bachelor of Arts in Sociology from the University of Alaska Anchorage. He is a graduate of the Northwestern University School of Police Staff and Command class 557, and has completed the FBI LEEDA Trilogy, Leadership in Police Organizations West Point Model, as well as numerous advanced command and tactical leadership courses.
Darius builds trusted partnerships and remains committed to mentoring the next generation of law enforcement leaders while fostering a resilient organization capable of meeting complex public safety challenges. The true measure of a leader is not based on position or authority, but positive and lasting impacts made on people, organizations, and the communities we serve.
