A 46-year-old man covered in blood stains was also at the scene and was arrested. Leaked photos and videos subsequently appeared showing a bloodied man apparently admitting to stabbing the woman after what he said was a heated argument in which she threatened to kill him, before allegedly stabbing her to remove evidence. CNN was unable to determine whether the man has legal representation.
Claudia Sheinbaum, mayor of Mexico City, said prosecutors would demand the maximum sentence against the alleged perpetrator, who the police said was the woman's husband.
"Femicide is an absolutely damning crime. It is scary when hatred goes to extremes, as in the case of Ingrid Escamilla," Sheinbaum wrote on Twitter.
But outrage over the terrible case increased after local tabloids and digital news sites published extremely graphic and leaked photographs of the victim's body. One of the newspapers, Pasala, showed the photos on the front page next to the headline "It was Cupid's fault". CNN contacted Pasala for comment.
The publication sparked fury by activists in the country, who have been taking to the streets in recent months demanding a change in the way in which cases of violence against women are handled and reported.
Mexican President Andrés Manuel López Obrador criticized the media's response to the murder.
Meanwhile, Mexico City's prosecutor's office is investigating public officials about the leak and is considering criminalizing the distribution of images of victims, it said in a statement.
López Obrador said at a news conference on Thursday that the person responsible for leaking the images should be reprimanded. "This is a crime that needs to be punished, whoever it is," he said.
Femicides – the murder of women because of their gender – have increased in Mexico in recent years; 1,006 cases were reported in 2019, compared with 912 the previous year.
According to the attorney general of Mexico, Alejandro Gertz, femicides have increased 137% in the last five years. Gertz said at a news conference earlier this week that if "there was no justice" for vulnerable groups, such as the elderly, children and women, "we would not be doing our job".
But women's rights groups have said that few murders are classified as femicides and that not enough criminals are committed.
"Mexico faces a major challenge in terms of violence against women," the country's National Women's Institute said on Wednesday, in a statement that also criticized the media for publishing the images.
"The distribution of images of criminal acts, as a way to defend crimes involving sensationalism, cruelty, mockery and morbidity, causes revictimization, trivializes violence and threatens the dignity, privacy and identity of the victims and their families," said the group. .
They added that the publication risked "preventing due process necessary to guarantee access to justice" and urged media organizations to act "ethically".
Many people on social media also posted photos of Escamilla alive in an attempt to neutralize the publication of the images, while others tagged her in posts showing scenes of natural beauty, including sunsets and starry skies.
Marches by feminist groups and supporters are expected to take place in the city on Friday and Saturday.
CNN's Jack Guy contributed reporting.