Richard N. Rosenberg, Brennon's attorney, said that Brennon will seek "a substantial amount of money" for her own injuries as well as the death of Santiago.

Brennon sustained multiple fractures to her face and ribs, and broke her leg in the accident that left seven dead and dozens wounded. She is recovering in Chicago, according to Rosenberg.

"She is going to have a difficult time," he said.

Brennon has been in and out of the hospital since the accident. As of Sept. 1 she remains in the hospital recovering from a blood clot breaking loose. She was expected to be released Sept. 2, according to updates from friends on www.brennonsantiago.com .

Santiago, a well-known LGBT health advocate in Chicago, was buried last month in her home state of New York next to her mother. Brennon and Santiago were among the first in Illinois to obtain a civil union license, said friends.

Brennon's suit has not yet been filed, said Rosenberg. He declined to comment on who will be named in complaint or what it will seek in damages.

The lawsuit is at least the fourth filed in the wake of the stage collapse. Three others were filed by attorney Kenneth J. Allen. One was on behalf of a woman who lost her wife. Allen has said that he wants to use that case to challenge Indiana's lack of same-sex partner recognition.

Rosenberg said it is likely that the wrongful death suits will be connected as the cases progress.