Nancy Ng Guatemala: A Monterey Park, Calif., woman who went missing in the Lake Atitlan area is calling on key witnesses to come forward

The family of a Southern California woman who disappeared in Guatemala is calling on the last two people who saw her alive to talk to investigators.

Nancy Ng of Monterey Park has not been seen since October 19th. It is believed that she went kayaking on Lake Atitlán with a yoga group that day, but many of the witnesses may have further information about her activities and have not cooperated with investigators.

“I personally urge these individuals to report to local law enforcement as soon as possible,” the search team coordinator said in a statement released Saturday on behalf of Nancy’s family.

The family says Guatemalan and U.S. authorities know the names of the two witnesses. Last week, the owners of the kayak company that rented the kayaks to the group spoke out, sharing details about what happened after the trip ended.

Lee and Elaine Beal, owners of Kayak Guatemala, said the yoga group Nancy was with said “not a word” to them after the excursion and left their hotel about 12 hours later.

READ MORE | Kayak company speaks out after Southern California woman goes missing in Guatemala

A helicopter company hired by Nancy’s family plans to continue their search this week.

Guatemalan government prosecutors I think she went swimming and drowned.

Nancy’s family sent a statement to ABC News last week saying, “Our family has attempted to contact the witness many times over the past three weeks, but she does not want to speak to us. The police report we received also did not contain any direct statement from her.” Your silence has hindered our search efforts and left us in the dark about what happened to Nancy. We don’t know what nightmare scenario to believe in.”

Nancy worked with children with special needs in the Alhambra Unified School District. They describe her as a loving and cheerful person.