Shadowhunters Photos from "A Window Into an Empty Room"

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The past has come back to haunt Simon! The aspiring rocker may have thought his wild phase would've stayed dead and buried. But, the truth looks like it's finding its way back on Shadowhunters Season 3 Episode 6.

Heidi, after only initially walking around Simon's boatyard apartment, has finally gone to see her Daylighter crush.

Related: Get Comic Con HQ via Prime Video Channels to Stream Original Series, Past Comic-Con Panels & More!

The two had a hot and heavy time together during their initial meeting when Simon was enjoying his vampire side. Both of the young adults liked each other, but their time was cut short when she was murdered. Fast-forward to her becoming a vampire and Simon now dating Maia. (Awkward!)

Based on the preview photos below, Simon doesn't look too happy to see Heidi again. He thought she was dead, and he nearly got into trouble because of it! Seeing her again must be a big surprise. Plus, she's clearly still into him while he's now in a relationship with someone else.

Related: Shadowhunters Season 3 Episode 5 Review: Stronger Than Heaven

Could her return shake up the Maia and Simon relationship?

Check out the photos below from "A Window Into an Empty Room," which airs Tuesday, April 24 on Freeform.

And don't forget, you can watch Shadowhunters online via TV Fanatic to get caught up on all the past action.

1. Past Hookup

Simon thought that Heidi was dead and buried after her suspicious death. However, she's back from the dead and wreaking havoc wherever she goes. This time, she's finally taking the courage to see him in person.

2. Heidi

Back from the dead as a newborn vampire, Heidi isn't taking her new chance at a second life for granted.

3. Unwanted Guest

Simon has moved on from his reckless days of blood bars and binge-drinking blood. It's all in the past, especially his times with Heidi. He doesn't look happy to see her in his apartment without an invitation.

4. Without A Doubt

Simon wants to be with Maia and have a relationship with her; Heidi is in his past. However, will his new vampire ex prove to be a problem for their relationship?

5. Wolf Instinct

Maia can sense that something is amiss with her boyfriend. Does she suspect that his past has come back to haunt him?

6. The Truth

Maia isn't one for suspicions; she only wants the truth from the person she's dating, and she deserves it. She can tell that something is going on in New York City.

7. Dinner With The Family

Isabelle has to attend a dinner with her family. However, someone has crashed the night with a bit of unexpected drama. Based on what we know of her family, things could get tricky.

8. Dinner Guest

Why is Heidi dressed up and looking like she'd rather be anywhere but there? Could she be the unexpected guest during the Lightwood's family dinner? Is Izzy in danger?

9. Ready To Fight

Trouble might be around and it's the perfect excuse for Isabelle to miss dinner. She's ready to take on another demon. She has her staff by her side and a determined look on her face.

10. Demon Hunt

Clary is teaming up with Magnus to hunt down a demon in New York City. They've found their way down a sketchy alleyway. Could the demon be dangerous?

11. A Mad Call

Who could Clary be calling? Why does she look like the world is ending? This might be a bad side.

12. Without Love

Jace is a new man after taking the potion from Lilith. All of his love for Clary is gone and he's now looking elsewhere. He won't be distracted from completing his mission for his demon master.

13. Live To Serve

Jace has nearly completed his mission of corrupting people as the owl demon. Lilith needs him to bring back another Mundane for the ritual. Who could it be?

Wait! There's more! Just click "Next" below:

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Shadowhunters Season 3 Episode 6: "A Window Into An Empty Room"
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Shadowhunters Season 3 Episode 6 Quotes

Simon: Heidi?! I thought you were dead.
Heidi: Yeah, not anymore. Thanks to you, Sire.
[She lips her vampire fangs]
Simon: How is that even possible?
Heidi: We both got a little carried away that night. That douche Quinn might’ve killed me, but I died with your blood on my lips.
[He steps away and walks back]
Simon: How did you come back?
Heidi: Raphael dug me up, but you’re the one that gave me life. And now we’re bonded...forever.

I know you’re in there, Jace Herondale. I know you’re suffering. When I’m done using you, you’ll return to find your friends dead and your world on fire. Burning at the hands of the son you so carelessly took from me. And when you scream and beg for death, I will smile. Now kiss me, you will need your energy.

Lilith