Megan says Sergei knows his way around a dead body. Ivan Sergei played an assistant medical examiner on Crossing Jordan (2001) 9 years earlier.
Sergei is played by an actor that has the same name as a last name. However, Ivan Sergei's birth last name is Gaudio and he was born in New Jersey.
Ivan Sergei is a New Jersey native playing a Ukrainian, who has an affair with Jeri Ryan, who was born in Germany (on a US military base) but plays an American.