While relatives and supporters of Adnan Syed celebrated a Maryland judge’s decision to grant him a new trial in the 1999 murder of his former girlfriend Hae Min Lee, members of Ms. Lee’s family on Friday expressed disappointment in the decision and said they remained convinced of his guilt.

“We do not speak as often or as loudly as those who support Adnan Syed, but we care just as much about this case,” the family said in a statement released by the office of the Maryland attorney general. “We continue to grieve. We continue to believe justice was done when Mr. Syed was convicted of killing Hae.”

“While we continue to put our faith in the courts and hope the decision will be reversed, we are very disappointed by the judge’s decision,” the statement continued. The family expressed gratitude to prosecutors “for standing by the true victims and for giving Hae Min Lee a voice.”

Mr. Syed, whose case was chronicled in the first season of the hit podcast “Serial,” was granted a retrial on Thursday by Judge Martin P. Welch of the Baltimore City Circuit Court. It was a major victory for an inmate who has maintained his innocence for almost two decades. He has served 16 years of a life sentence after being convicted in 2000 of first-degree murder and kidnapping.