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Marjorie Reitzell, suspected of killing a Menlo Park couple in an alleged drunken driving accident on Oct. 24, 2013..

San Mateo County's top prosecutor said Tuesday he may seek second-degree murder charges against a Redwood City woman accused of driving drunk when she fatally hit a Menlo Park couple who were out walking their dog.

District Attorney Steve Wagstaffe said evidence is still being gathered about the suspect, 54-year-old Marjorie Reitzell, and events leading up to the Oct. 24 accident that killed Kamal Singh, 45, and Balbir Singh, 50.

"It's something we'd consider. It was a major topic of discussion yesterday when we had to file charges," Wagstaffe said. "What it takes to elevate it is a willful and conscious disregard for the safety of others."

Reitzell currently faces two counts of gross vehicular manslaughter while intoxicated, along with a felony count of drunken driving and causing multiple injuries and an enhancement for having a previous drunken driving conviction. When she hit the Singhs, Reitzell was on probation for a DUI offense that occurred in September 2012, Wagstaffe said.

The Singhs were walking their dog within the bike lane on Chilco Street west of Constitution Drive just minutes before 7 p.m. when they were hit from behind by Reitzell, according to Menlo Park police. She then continued east on Chilco Street until her vehicle hit the center median and landed in the westbound lane, where she hit another vehicle before crashing into a tree.

The preliminary investigation revealed that Reitzell had spent the day drinking, Wagstaffe said; her blood alcohol level at the time of the accident was "significantly" more than twice the legal limit.

"This woman drank herself into a stupor," Wagstaffe said.

Reitzell was originally scheduled to be arraigned Monday, but the court hearing was postponed until Tuesday after she complained of chest pains, according to Wagstaffe. On Tuesday, the hearing once again was delayed for a day because of an undisclosed medical concern. She is being held on a $2 million bail.

Outside the courthouse, Ronald Reitzell told reporters that his younger sister had been grieving over the recent death of their mother.

"It's a lose-lose situation, you know what I mean? She's got a daughter and two granddaughters who won't be able to see her for the rest of her life maybe," Reitzell said. "The children of the Singhs, they lost their parents."

The Singhs' funeral is scheduled for 10 a.m. Thursday at the Chapel of Chimes in Hayward. The couple are survived by three teenage children -- two daughters who are 18 and 17, and a son who is 15.

Email Bonnie Eslinger at beslinger@dailynewsgroup.com; follow her at twitter.com/ bonnieeslinger.