"My mom would fight any battle for us and for her honor, even if there was no one to fight," her son, Trinidad "Michael" Angel Rivera recalled Wednesday. "Sometimes it seemed like she was just waking up to fight the day, to prove that in those 24 hours, she could make 35 hours worth of work."
He asked audience members for 27 seconds of silence in honor of the victims of last week's shooting rampage in Connecticut.
"I know my mother would have been heartbroken to hear about something like that," he said. "Because even though for me, it was a tragedy to lose my mother at 27 years old, there were mothers who lost their children before they got the chance to find out who they were going to be, whether they were going to be singers or doctors. ... They didn't have a chance to live."
Plane company investigation
Rivera performed at a concert in Monterrey on December 8 before boarding the Learjet early the next day. It lost contact with air traffic controllers about 60 miles into the trip.
The small plane was 43 years old, the state-run Notimex news agency reported, citing the Mexican director of civil aviation.
The Drug Enforcement Administration is investigating the company that owned the plane.
Court records showed that the aviation company, Starwood Management, had two planes seized this year. The DEA declined to give further details, citing an ongoing investigation.
But it confirmed that the company was in a dispute with insurance firms over accusations of of falsehoods. Starwood and its representatives have not responded to repeated CNN requests for comments.
The U.S. National Transportation Safety Board said it is helping with the investigation.
U.S. records show the airplane was substantially damaged in 2005 when it struck a runway marker near Amarillo, Texas. At the time, the plane's pilot reported losing the ability to steer while landing the plane.
As the investigation into what caused the crash continues, family members said Wednesday that they were grateful to fans for their support and were committed to honoring Rivera's legacy.
"The best thing you ever taught me is when you fall, you get back up," daughter Jacqie Melina Campos said. "So that's what I'm going to do."
As the ceremony drew to a close, confetti fell onto the stage, and family members and fans covered Rivera's casket with white roses.
A band played the last few bars of "I Will Survive" before a recording of Rivera's voice boomed through the speakers.