Disclaimer: No, I don't own Criminal Minds. If I did, Will would never have shown up again after 'Jones' and Beth would not exist.
She'd first spotted him during an early morning run in the park near the museum; tall, dark and handsome with an ass she would gladly stare at all day. Unfortunately, her tried-and-true method of getting someone's attention, jogging ahead of him, didn't pan out as she'd hoped; he was either too focused on his run or not the type to hit on random women in the park. However, a carefully timed glance at his hand hadn't revealed a wedding ring, so she continued on and figured she'd get a shot on another day.
As luck would have it she saw him again a few days later in the parking lot of the FBI Academy when she was on her way to meet a friend for lunch. Over the meal, she learned that his name was Aaron Hotchner; head of the Behavioral Analysis Unit and according to office gossip, likely to be promoted to Director someday. Unfortunately, her friend couldn't tell her much more than that and that he was a widower; Sue had only transferred to the Academy's legal department a little over a year ago and while gossip ran rampant, factual information about the BAU team was hard to come by-apparently they weren't ones to gossip outside their group. A quick search online brought up a little more information-he'd been a successful federal prosecutor before joining the Bureau and was a nationally renowned profiler.
Over the next few weeks she would discover that he was a consummate gentleman as well. A carefully timed stumble during her run brought about his help and an introduction. She decided to take the initiative again, figuring that he'd appreciate a woman showing her interest openly and suggested that they train together for their respective events. Phone numbers were exchanged and a time agreed upon for a bike ride the following day. Unfortunately, he was called out of town and their ride was postponed for a few days, though promptly rescheduled upon his return. She saw him several times after that and slowly learned more about him; he had a young son, who he obviously adored, maintained a good relationship with his late-wife's sister and was close to his team. Also, he really was chivalrous to a fault, though that was discovered more through his actions than anything else: her various hints at getting together outside of their runs and bike rides were politely declined due to his schedule and the difficulty involved in keeping commitments and he seemed oblivious to her non-verbal cues at being interested in engaging in a different form of exercise with him. During their work-outs, they spoke of her work at the museum, his son and even a little about his team, though he never said more than a few vague words about whatever case they'd been working on at the time.
About three weeks after their first bike ride, she tried calling him to see if he wanted to accompany her to an event at the museum on the coming weekend but was chagrined to only reach his voicemail. When he finally got back into town, she found out that his phone had been damaged in an altercation with a suspect and he hadn't gotten a replacement yet. Too add to her disappointment, he also turned down the invite, saying that he'd already made plans with his son for the weekend. But never let it be said that Beth Clemmons gave up on getting a man she wanted; undaunted, she asked if there was someone she should call if she needed to reach him and couldn't get through. He seemed surprised at the question but gave her two numbers, stating that Rossi or JJ usually knew where he was when they were on a case. From previous conversations, and a Google search, she knew that the famous author was his best friend but he'd only mentioned JJ a couple of times in passing before. She already knew it was not easy to get more than general information regarding his team out of him, so she didn't question it further, just entered the numbers into her phone for future reference.